I want to use two motor shields. I've followed the advice in this topic http://forum.tinycircuits.com/index.php?topic=1594.0. I've scraped the black coating from resistor R1 as much as I can. The resistance across R1 is now 3.31 kOhm (the resistance across an unscraped R1 is 1 kOhm) My code looks something like this:

Code Select Expand


MotorDriver motor(0);
MotorDriver motor1(1);
const int maxPWM = 10000;

void setup() {
  if(motor.begin(maxPWM)){
      Serial.println("Motor driver 0 not detected!");
      while(1);
  }
  if(motor1.begin(maxPWM)){
      Serial.println("Motor driver 1 not detected!");
      while(1);
  }
}


When I run this, I see "Motor driver 1 not detected!". Have I not scraped off enough of the black coating off the resistor, or is it an issue with the code?

Hi Fisu,

When you scrape the resistor, you have to scrape it to the point of the circuit flowing open, with no resistance. I think that's the primary issue. I don't see anything wrong with the code at a glance, but if you still want to check, there is a reference manual and an example program in this GitHub repository for the TinyCircuits Dual Motor library.

https://github.com/TinyCircuits/TinyCircuits-TinyShield_Motor_Library

Let me know if that works!

- Lilith

Thank you. I kept scraping but the resistance reading kept increasing. Eventually I scraped it so hard that the resistor broke off. So I got the desired result in the end. Thanks.