Arduino pulsein alternative

Arduino pulsein alternative. B. write(0) time. Just spent the whole afternoon trying to get pulseIn to work grrrrrrrrrrr: it always returns 0 for me, even though I'm sure the pin I'm reading has been sent high for a while. The HC-SR04 ultrasonic sensor uses sonar to determine the distance to an object. 1500us. Is it posible to do this? Maybe by using pulseIn function with address of the exact pin, but I don't now how. Restituisce la durata dell’impulso in microsecondi. The code for pulseIn calls the following macro, with the timeout you pass as the parameter: #define microsecondsToClockCycles (a) ( ( (a) * (F_CPU / 1000L)) / 1000L ) With F_CPU = 16000000L, the expression becomes (a * 16000L) / 1000L. The only catch with this is that it seems to be very slow. Feb 29, 2020 · import pyfirmata from pyfirmata import util import pycom import time # code for combining arduino with pycharm: port = pyfirmata. You need a timer set in Capture Mode. This is my own fork of the original Nov 30, 2019 · That post never determined why their pulseIn () call was often timing out. Jul 20, 2021 · Introducing the HC-SR04 Ultrasonic Sensor. 「 Arduino 入門 番外編 21 【pulseIn関数 まとめ】 」. ==> are you Oct 7, 2011 · EDIT - I'm using Arduino 0022. print() and I bet the compiler hasn't either. JimboZA May 27, 2012, 2:51pm 1. digitalWrite(triggerPin, HIGH); delayMicroseconds(10); digitalWrite(triggerPin, LOW); duration = pulseIn(echoPin, HIGH); cm = duration/29/2 /* For inches: /74/2 */. 3v pulse of 1500us is reaching Dec 19, 2019 · Hi Arduiners, I was so excited about getting this Nano BLE Sense that I have not thought about all potential compatibility issues. A Python API for communicating with your Arduino board. Du kannst sogar den externen Interrupt nutzen, um den Timer. Gibt die Länge des Impulses in Mikrosekunden Dec 26, 2015 · Re: Arduino Uno pulseIn () Alternative. You have no other option on which pins can be used. As long as the device connected to the pin can reliably pull the pin LOW, why not? timing operation of the sensor. My question to you all lies in my problem with getting the pulseIn function to read a complete low every time. // digitalRead() instead yields much coarser resolution. Jul 25, 2016 · Using Arduino General Electronics. This is what it says in description. The retuned value of the pulseIn ()-function was around 566-576. // Read Receiver. write(1 Feb 13, 2014 · Hello all, I'm new to Audrino but not new to programming & Microcontrollers, so far I'm loving the Audrino. Oct 25, 2017 · In the schematic you will see that there are 2 test probes called "Current" and "Voltage" respectively, which are connected to the Arduino PWM read inputs (Pin 2, 3). I have flashed the following code on the Uno and on the Nano 33. danielfigueiredo1992 January 18, 2024, 8:05pm May 13, 2024 · Description. dc42 October 7, 2011, 8:41pm 2. 정해진 timeout 안에 Feb 22, 2014 · Also, instead of using pulsein(), attach an interrupt that just counts the pulses. Then the pulseIn function stops the Dec 28, 2022 · Simple interrupt-based alternative to arduino's pulseIn function. The source of pulse is a Tektronic signal generator (Duty cycle set to 50. I'm having an issue with PulseIn() I can read pulses but it slows my program down to the point that it isn't useable. It is capable of reading the lengths of both low and high pulses with a configurable timeout, after which the method will return 0. I'm struggling with deciding on how to measure the flow through the flow sensor, if I should use a. g. begin…. For example, if value is HIGH, pulseInLong() waits for the pin to go from LOW to HIGH, starts timing, then waits for the pin to go LOW and stops timing. Aber das sind immer wesentlich mehr als 3 Minuten, wie lange die LED an oder aus ist. Filename Release Date File Size; pulseInput-1. (int) timeout (optional): the number of microseconds to wait for the pulse to be completed: the function returns 0 if no complete pulse was received within the Feb 19, 2013 · Hi Leute, ich bin auf der Suche nach einer Altenative für PulseIn(). a second frequnce i tested had a pulse-width of 1440 microseconds, the returned value of the pulseIn-function was 1880-1890. The value is the level of the pulse. May 13, 2024 · Description. Mar 3, 2011 · Using Arduino Programming Questions. 5 start = 1 while start > 0: port. Releases Jan 18, 2024 · With such voltage you can't use pulsein at all, regardless of the kind of pin - digital or analog. 예를 들어, value 가 HIGH 이면, pulseIn() 은 핀이 HIGH` 가 될 때까지 기다리고, 타이머를 시작하고, 핀이 LOW 가 될 때까지 기다리고 타이머를 멈춥니다. 0. attachInterrupt(0, interruptHandler, RISING); The in another sketch I do: void interruptHandler() {. You signed out in another tab or window. if i use the PulseIn() function anywhere in my program the blinking of the led will not blink at the desired frequency instead it pulseIn() função Captura a duração de um pulso em um pino (que pode ser `HIGH` ou `LOW`). In addition, this particular module comes with ultrasonic transmitter and receiver Jan 9, 2012 · Reads a pulse (either HIGH or LOW) on a pin. Reload to refresh your session. However, I just found out that I have +/- 1 microsecond delay and I would like to avoid this. あらためて、Arduinoを使って関数を一つ一つ理解するのも学習にはもってこい。. But I got an issue when I use together the pulseIn () method with BLE Central Connected. pulseIn () and pulseInLong () in Arduino - If there is an incoming pulse on a pin, and you need to measure the duration of the pulse then the pulseIn () function comes in handy. 1. 22 KiB: pulseInput-1 Apr 10, 2022 · まとめ. PULSOUT Ping, Trigger ' activate sensor. The timing of this function has been May 13, 2024 · Reads a pulse (either HIGH or LOW) on a pin. I cannot get the Arduino Nano 33 IoT to use the pulseIn function to measure frequency. when you do pulseIn(mhz19_SENSOR_PIN, HIGH, 1004000); it waits for the pin to go HIGH, starts timing, then waits for the pin to go LOW and stops timing and returns the length of the pulse in microseconds. pulseln () is not designed for the DUE. Returns the length of the pulse in microseconds. I'm using an UNO to measure a duty cycle. This library is compatible with all architectures so you should be able to use it on all the Arduino boards. I would like to read clock pulse from PWM pin with pulseIn command for per second. h" does not support the function pulseIn, which is necessary to get the value of time. Feb 18, 2016 · Well im new to coding, but i do have the basic knowledge. まずは、基本を理解して応用してみましょう。. However, I want to make my own IR system which can use more than 2 pulse lengths Aug 12, 2014 · Hi! I wonder how to connect ultrasonic sensor to arduino using an expander. Jan 18, 2024 · Here's what's writes on documentation that says that pulsein is for digital pins. The simple way to measure the pulse width, is to use the pulseIn () function. It's based on an arduino (duemilianove) and a flow sensor. Feb 15, 2009 · The Arduino allows two external user interrupts but must be wired to either pins 2 or 3 only. Jul 30, 2021 · Career. Releases May 14, 2014 · This ultrasonic sensor that works as follows (most works like this, indeed): In Arduino you typically do: Code: Select all. 정해진 timeout 안에 Descripción. The timing of this function has been Oct 16, 2018 · You signed in with another tab or window. zip: 2022-12-28: 8. Downloads. Nov 30, 2009 · Below is a sample of the BasicTAMP code. Mit dem besagten Timer kannst Du dann die Pulsbreite genau. it will also give up and returns 0 if no pulse starts within a specified time out. You switched accounts on another tab or window. What I tried. Retorna o tamanho do pulso em microssegundos ou pulseInLong() is an alternative to pulseIn () which is better at handling long pulse and interrupt affected scenarios. Ich möchte eine LED überwachung und zum Event LED = High etwas schreiben und dann wieder bei dem Event LED = Low. Por exemplo, se o valor HIGH é passado para a função, a função pulseIn() espera o pino ir para do estado 'LOW' para HIGH, começa a temporizar, então espera o pino ir para o estado LOW e para de temporizar. Descrizione. Even though it is STAMP code it is very clear that you send a pulse. I would be very grateful if you could share a sample code. I've found a workaround, but it's not very elegant. Reads a pulse (either HIGH or LOW) on a pin. Aug 20, 2012 · Hi All, I have a 40mhz 6 channel RC transmitter and reciever, the rx has no individual servo channels, it continually outputs the pwm channel stream to a controller board on a boat. data = pulseIn (PI_IRSensor, HIGH) //Would get the number but no time out. pin: the number of the pin on which you want to read the pulse. The code: unsigned long pulseIn (uint8_t pin, uint8_t state, unsigned long timeout) {. begin(250000); Jun 17, 2014 · The pulse of the generated rectangle-signal had a pulse-width of 440 microseconds. Hi, thanks in advance. Simple interrupt-based alternative to arduino's pulseIn function. The sensor sends a pulse and then just waits for the echo an when the echo arrives, sets the echo pin HIGH. begin(115200); pwm_value_H = pulseIn(PWM_PIN, HIGH); Nov 28, 2021 · Hello everyone i have just started to use arduino. The simple way to use these functions for measuring a Jun 9, 2014 · When this is happening, the program is in the line of pulseIn, and since echopin is in HIGH it starts timing (because pulseIN (echopin,HIGH) waits for echopin to be HIGH for start timing). my code is as follows, pinMode(PWM_PIN, INPUT); Serial. 10. Aug 12, 2016 · Hi! I'm building a solution for measuring fuel consumption in my boat. Releases Feb 5, 2021 · arcarruda February 5, 2021, 7:59pm 1. // digitalRead () instead yields much coarser resolution. sleep(. May 27, 2012 · Using Arduino Programming Questions. The calculation of the duration take place later. Die 3min. Iv'e read that there is function called PulseIn () in the arduino but not much talked about. TimeOut = the timeout in ms where the code needs to stop after it reaches a longer pulse than this. Radar by tirithen, on Flickr And the code #include <Servo. Note that you don't have to set the pin mode for 2 or 3 as the Jul 4, 2020 · The pulseIn() function will wait up to a preset timeout for the pulse. The default timeout is 1 second, I think. An example sketch to capture frequency and duty cycle of an input pulse provided by the board itself: Serial. Returns the length of the pulse in microseconds or gives up and returns 0 if no complete pulse was received within the timeout. ) pulsein to Description. An alternative approach would be to use CHANGE interrupts. system March 3, 2011, 7:47am 1. The main problem is that the library "PCF8574. On the transmitter, channel 6 is a simple non latching push to make switch, i have replaced this with a 3 way non latching toggle switch, so it gives me down, centre and up, so 3 functions from 1 switch. von Matthias M. For example, if value is HIGH, pulseIn () waits for the pin to go Mar 11, 2020 · maxloops counts cycles of a timing loop inside countPulseASM (). Here's what I tried to do: basically used the code in the reference, where it uses pulseIn to read For example, if value is HIGH, pulseIn() waits for the pin to go from LOW to HIGH, starts timing, then waits for the pin to go LOW and stops timing. Si interrompe e restituisce 0 se nessun impulso Aug 25, 2010 · I have recently bought a Arduino Duemilanove (ATmega328) and two ultrasonic range finders and are now trying to create a 360deg distance sensor with these and a hobby servo. Author: RCmags. Lee un pulso (HIGHo LOW) en un pin. pulseIn(pin, value,30000); An alternative to using pulseIn() is the NewPing library. // pulse width measuring loop and achieve finer resolution. The signal was connected to pin 2 and Ground was connected to GND of the Sep 15, 2014 · It produces a pulse whose width is directly proportional to the range to the object. counter (). Feb 29, 2020 · Are there any alternative functions to pulses_get? import pyfirmata from pyfirmata import util import pycom import time # code for combining arduino with pycharm May 13, 2024 · pulseInLong() is an alternative to pulseIn () which is better at handling long pulse and interrupt affected scenarios. I've tried to measure the signals in A0 and A1 inputs; I've also measured the number of pulses at the output after the OPAMP (zero crossing), the smoothing code provided to make Apr 6, 2018 · delay (2000); } J-M-L April 6, 2018, 3:45pm 2. pulseInLong() is an alternative to pulseIn () which is better at handling long pulse and interrupt affected scenarios. 펄스의 길이를 마이크로초 단위로 반환합니다. Everything Reads a pulse (either HIGH or LOW) on a pin. PULSIN Ping, IsHigh, rawDist ' measure echo pulse. Non-blocking alternative to pulseIn. Descrição. I have a separate microcontroller (8051) sending my Arduino a 1Hz signal to simulate constant 1s just to troubleshoot the program, and it's acting extremely oddly. It works well for distinguishing pulses which are significantly different lengths, e. coud somebody tell me more about it. But when I compile the same code as used with Arduino Nano Jun 23, 2017 · 9. const int switchpin = 2 ; //connected to switch. You can reset it with tim. To change the timeout, set the third (optional) argument. digital[trigpin]. Timeout reichen mir nicht. Non-blocking alternative to pulseIn Simple interrupt-based alternative to arduino's pulseIn function. หัวข้อนี้จะกล่าวถึงการใช้ฟังก์ชัน pulseIn และใช้บอร์ด Arduino UNO R3 เพื่อวัดความกว้างเพาส์สัญญาณ (Pulse width Jul 4, 2021 · Everything you need to know about what is a pulse, and how to measure the duration of a pulse with the pulseIn() Arduino function - using an example with a p Dec 10, 2010 · There are two pins 7s on the Mega. sich ändert. Por exemplo, se o valor `HIGH` é passado para a função, a função `pulseIn()` espera o pino ir para do estado 'LOW' para `HIGH`, começa a temporizar, então espera o pino ir para o estado `LOW` e para de temporizar. setup needs its parentheses (). There is no timing operation of the sensor. Pinmode(switchpin,INPUT); // set the switch pin as input. So I am trying to create a simple device where will mesure the distance using ultrasonic sensor and send the distance to a Central. When the first pulse of the 40 kHz bounces in the object and gets back to the receiver, the echopin sets itself in LOW. Retorna o tamanho do pulso em microssegundos ou desiste e retorna 0 se não 1uS is going to make it fairly difficult; that gives you 16 instructions (at best) to do the processing, and that's really tight. Arduino('com4') iterator = util. counter (0). Pinmode(transistorpin, OUTPUT); //Set the transistorpin as output. To emulate the micros () function, you can create a timer at freq=1 000 000 Hz (1MHz -> 1µs resolution), and get its current value with tim. uint8_t bit = digitalPinToBitMask(pin); Feb 10, 2022 · The pulseIn() function is used to read the pulse length of a signal of a given level on a given pin. Aug 28, 2020 · Ultrasonic Sensor HC-SR04 Test with Arduino UNO R3 Start ~ trig LOW ~ 10us delay ~ trig High ~ 10us delay~ trig High ~ pulseIn ~ Duration 0 8 12 8 12 4 7352 137976 4 Liest einen Wert von einem vorgegebenen Digitalpin ein, entweder HIGH oder LOW. Looks like a bug in the library. eads a pulse (either HIGH or LOW) on a pin. grosleon91 May 6, 2015, 5:20pm 1. You get an interrupt when the signal goes high and low. It is written using a custom protocol, similar to Firmata. Por ejemplo, si el valor es alto, pulseIn () espera a que el pin pase a nivel HIGH, se inicia el tiempo, espera a que el pin pase a nivel LOW y para el cronómetro. In my program i am using the pulseIn () function with the time out specified: int pulsePin = 10; unsigned long pHigh; unsigned long pLow; unsigned long interval; void setup () { pinMode (pulsePin, INPUT); Serial. For example, if value is HIGH, pulseIn () waits for the pin to go HIGH, starts timing, then waits for the pin to go LOW and stops timing. SyntaxThe syntax is −pulseIn (pin, value)Where pin is the number of the pin on which you wish to measure the pulse. Jan 1, 2017 · Re: equivalent to Arduinos pulseIn (), micros () by fma » Mon Jul 07, 2014 2:44 pm. Du musst einen externen Interrupt nutzen, der auslöst, sobald der Input. I've never heard of serail. Wie kann ich das denn anders lösen (die Intervalle sind nicht immer gleich)? Viele Non-blocking alternative to pulseIn Simple interrupt-based alternative to arduino's pulseIn function. Aug 11, 2021 · pyArduinoAPI. Probably the newbie's (lack of) mindset. I agree that the pulseIn page should probably clearly indicate that it only works with digital pins, however it does talk about HIGH and LOW which are digital pin terms. Aug 20, 2018 · I have used there code example but changed it a bit because I want to measure from HIGH to LOW so the pulse in function to do this would be: pulseIn(3, LOW); so I wrote this code to replace that function: volatile int pwm_value = 0; volatile int prev_time = 0; void setup() {. The function: attachInterrupt (interrupt, function, mode) is where interrupt 0 means input pin 2 and interrupt 1 means input pin 3. bestimmen. If the level is set to HIGH, the function will wait for that level to appear on the pin, then start the timer and stop it when the pin is again at logic zero ( LOW ). Possibly the Arduino Ground was not connected to the Receiver Ground. Go to repository. 000 with frequency of 2khz). (Firma: privat) ( quadraturencoder ) 2015-12-27 04:41. For example, when I assign the value 255 to the pwm pin, I want to read the value 255 with the pulseIn command in serial port screen. void setup() {. Feb 23, 2015 · I've been having problems getting started with my first program. Iterator(port) iterator. 3cm (0. Daraufhin stoppt pulseIn() den Timer. 8inch to 157inch) with an accuracy of 0. I have a simple program blinking an led. Get_Sonar: Ping = IsLow ' make trigger 0-1-0. Describing the advantages it has over using delay function. Liest einen Wert von einem vorgegebenen Digitalpin ein, entweder HIGH oder LOW. 次回の「 番外編 22 」は【IOピン ポート Mar 24, 2016 · pulseIn(pin, value) pulseIn(pin, value, timeout) Parameters. That makes it more than sufficient for handling typical IR remotes. pulseIn(pin, value, timeout); 30 milliseconds is about 15 feet (3 meters). 8. Maintainer: RCmags. pulseIn () seems to display a strange bug of unstable output when read from two different input pins. 1, or 2KHz). The sensor generates 10 000 pulses per liter that passes, and given the fuel consumption of my boat I expect to get between 2,5 and 340 pulses per second. Captura a duração de um pulso em um pino (que pode ser HIGH ou LOW ). 何気なしに使っている関数。. Gives up and returns 0 if no pulse starts within a specified time out. pulseIn blocks the program until a signal is received, which is almost always undesirable. I am currently using an ultrasonic sensor JSN-SR04T (very similar to HC-SR04 - the code works very well for both). I'm trying to use the pulseIn function to decode a WWV timecode, and I can't seem to get numbers that make sense. PulseIn () is the timing feature. I've been using the pulseIn() function for processing PWM-based binary data encoding. (int) value: type of pulse to read: either HIGH or LOW. Then, for a pre-defined sample period (say 100ms or whatever you like) you know the frequency as the pulses divided by the period (200 pulses over 100ms is 200/0. . Here's the problem: I'm using two TSL230 chips to read two different light sources and I'm using pulseIn () to read them like so: SENSOR1_duration = pulseIn pulseInLong() is an alternative to pulseIn () which is better at handling long pulse and interrupt affected scenarios. Compatibility. I have a personal hobby project with 4-pin PC fans that I control with a 25 kHz PWM created by altering Timer2 (which affects PWM pin 3 and 11) as May 31, 2022 · The interrupt is triggered with the rising and falling edge and store the start & endtime with the funktion micros() in two diffrent variables. Please help me 🙂 Here is my code: #define trig 2 #define echo 1 #include Feb 9, 2009 · Hello, in Arduino 0011 I've been successful in reading multiple channels from an RC receiver by doing the following: // Setup interrupt to trigger on pin D2. h> // setup pins #define radarFrontEchoPin 2 #define radarFrontInitPin 3 #define radarBackEchoPin 4 #define radarBackInitPin 5 #define radarServoPin 6 unsigned long May 13, 2024 · Description. Oct 16, 2020 · In this tutorial I am looking at using millis function in the code. A lightweight Python library for communicating with Arduino microcontroller boards from a connected computer using standard serial IO, either over a physical wire or wirelessly. PI_IRSensor = The pin where the pulse needs to be measured from. Nov 29, 2019 · The serial monitor when using pulseIn () is printing zeros, while the serial monitor when using analogRead () still shows that the pulse is coming in just fine. I am also still seeing that the serial monitor is delaying before each print meaning the pulseIn () is timing out and not seeing a signal even though a 3. I believe that May 13, 2018 · data*= Where I need to store the length of the pulse*. Since they were getting no pulses in a million microseconds I suspect there was a wiring problem. For example, if value is HIGH, pulseIn() waits for the pin to go HIGH, starts timing, then waits for the pin to go LOW and stops timing. Suppose the expected logic level does not appear on the pin within a certain Oct 9, 2015 · การใช้งาน pulseIn ฟังก์ชัน ตอนที่ 1. The timing of this function has been Dec 8, 2008 · system December 8, 2008, 2:35am 1. Legge un impulso (sia di tipo HIGH oppure LOW) su un pin. This sensor reads from 2cm to 400cm (0. Feb 26, 2020 · Probably a version that doesn't try to guess instruction timing on a CPU with non-deterministic flash memory timing. Per esempio, se valore = HIGH, pulseIn() aspetta che il pin vada nello stato HIGH, incomincia a contare, quindi aspetta che il pin vada nello stato LOW e smette di contare. 500us vs. I want to interface a HC-SR04 ultrasonic sensor with ESP32, and to do that, I need to measure the pulse width of the ultrasonic sensor to microsecond precision, and in Arduino there is pulseIn() function which do exactly that. Gibt die Länge des Impulses in Mikrosekunden Oct 31, 2019 · Espressif ESP32 Official Forum. One set to measure a rising edge, and the other a Jan 1, 2023 · Hi all, I am working with my son to use a hall effect water flow sensor, measure the frequency, convert the results to gallons per minute, and post the results on the cloud. communication between two arduino's. start() trigpin = 12 echopin = 13 speedOfSound = 776. The pulseIn function measures the time period of a high or low pulse input signal. My board: Arduino Nano 33 BLE Sense. 설명. That makes 'timeout' an estimated, not exact timing value. Serial. rawDist = rawDist */ Scale ' convert to uS. A typical use is to measure the output from an ultrasonic distance module (HC-SR04) which outputs a signal period proportional to the round trip sound reflection time from which you can calculate distance. For example, if value is HIGH, pulseIn() waits for the pin to go from LOW to HIGH, starts timing, then waits for the pin to go LOW and stops timing. Apr 16, 2016 · I would not recommend using pulseIn for reading values from the receiver. Since they didn't specify a timeout they got the default: 1 MILLION microseconds. pulseIn returns the length of the pulse in microseconds May 10, 2012 · unsigned long pulseIn(uint8_t pin, uint8_t state, unsigned long timeout) {. Nov 24, 2012 · Hello to you all! Let me start by stating that I'm a complete beginner to the Arduino platform and sadly only a novice in programming. Read the documentation. Description. Would it be feasible to feed the pulse from the EZ4 to two interrupt pins. // cache the port and bit of the pin in order to speed up the. However one of the arduino's is using the pulseIn () function for distance calculation from an ultrasonic sensor. Devuelve la longitud del impulso en microsegundos o 0 si no se recibe un pulso completo dentro del tiempo de espera. 002) port. But the pulseIn () function is messing up my serial communication because it is a 'blocking' function. You need to amplify the signal first. This class adds pulse-length reading functionality to the DigitalIn class. I'm very interested by such feature too. Apr 13, 2017 · The arduino is sending pulse signals to the driver, rotating the motor at 4 different speeds (2, 4, 8 and 16Hz - or 120, 240, 480 and 960 RPM) and during each speed I'm reading the pulse signal with PulseIn, calculating the frequency and comparing to the motor's frequency so I can find out how many pulses the sensor's outputting during one May 6, 2015 · Using Arduino Programming Questions. I already tried to use the function pulseIn(). 1inches), which is good for most hobbyist projects. Normally I'd suggest that you do interrupts but I think the overhead of calling the interrupt is going to kill you. Feb 3, 2015 · I have a project that uses wireless serial. HIGH ist, wartet pulseIn() darauf,dass der Pin auf den Wert HIGH wechselt, startet einen Timer und wartet anschließend darauf, dass der Pin wieder auf LOW wechselt. calling. begin(9600); attachInterrupt(0, falling, FALLING); pulseInLong() is an alternative to pulseIn () which is better at handling long pulse and interrupt affected scenarios. anishkgt July 25, 2016, 1:42pm 1. May 15, 2018 · The code doesn't compile so it definitely won't work. 핀에서 펄스 (HIGH 또는 LOW)를 읽습니다. Wenn value z. // This has been tested with AR6100 and AR6200 Spektrum receivers. One of them is an analog pin, and won't work with pulseIn. The simple code is as follows: const int transistorpin = 9 ;//connected to base of transistor. The other one is a digital pin, and will work with pulseIn. qz ro dn dd wp lh tw ai bi lv