Hello: I have a sensor which can use either i2C or PWM (please see attached). I tried the PWM approach with an Arduino MEGA and DUE and it worked fine. On a Particle Photon, I could not get it working with PWM. I only got it to work with I2C but I prefer PWM. Is there a difference when using a …

Yes, the Photon supports pulseIn within some limits-the doc is here: https://docs.particle.io/reference/firmware/photon/#pulsein- Do you have a common ground connection between the Photon and the Arduino you are using for power so that the entire system has a common ground reference? It would be …

i think you might want to check if the serial should be set to 115200 across all settings. i think they suggest to use 115200 on the lidar. if you decide to go with 115200, check the com port setting as well.

If you are powering the sensor from the Arduino, have you got common ground between the Arduino, the Photon and the sensor? (as I just realised @bko already pointed out :blush:)

Hello: Thank you for your help. I changed and simplified the wiring and my code is below. Still no measurements. I have attached a picture of my circuit. unsigned long pulseWidth; double tempC = 0; void setup() { Serial.begin(115200); // Start serial communications pinMode(D2, OUTPUT); //…

[image] joost: measured the incoming pulse on the input pin I have not done that as I do not know how to do it ...

Well the best thing would be to get a scope… But you could hook up a voltmeter on the LIDAR output signal and vary the distance it is reading. Since that is supposed to produce a different pulse width, you should see some change in the DC signal. You may have to play with your voltmeter range settin…

be positive that the resistor is very tight in that breadboard and place wires in opening directly next to the resistor for all wires. plug a 5v power supply into protoboard via barrel jack.

OK, gentlemen, I followed your guidelines. I am using the same code on both an Arduino and the Photon (only difference is preceding the pin with a D for the Photon). I am using the SAME sensor circuit for each board. On the Arduino, everything works. On the Photon, per Joost, indeed the blue…

@Jimmie , print the “raw” pulseWidth and don’t do the divide by 10. What do you get? Also, D7 has an LED connected via a current limiting resistor which may affect the circuit. Can you try another pin like D2/

PWM Sensor not working with Photon

Hardware

Jimmie May 10, 2017, 10:57am 18

Realized mapping of shield so wired sensor directly to Photon. Again, all readings = 0

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PWM Sensor not working with Photon

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