I am following this tutorial in my attempt to create my first Pi based robot.

I am using a Pi 3 model B and I believe I have things wired up correctly however while the H-Bridge is powered up, the Pi isn't.

The Pi's LED actually does switch on but it is not listed on my routers IP addresses list. As a result I can't SSH into it.

However, if I plug the Pi independently into power it responds and works as expected.

Can anyone help, please? There's a screen shot below incase it helps.

enter image description here

  • Do you have a Pi 5V pin connected to the motor driver board? The motor driver board may be generating 5V from the motor supply unless you have removed a particular jumper from the motor driver board. You will then have the two 5V supplies fighting each other. – joan Mar 9 '18 at 8:44
  • Connect a screen and and check what it shows. If it shuts down, then use a proper power supply and enable boot up logs to see whats wrong. – not2qubit Mar 9 '18 at 15:07

Those batteries simply can't handle driving the entire RPi3 + H-bridge + motors. The batteries are each rated at 2.85 Ah, but RPi3 alone, need a constant power supply of not less than ~2A. Either use a RPi0 or another battery, such as those for mobile phones.

I bet if you connect a screen to that pi, the low power flash would be shown.

| improve this answer | |
  • My Pi3 powers quite happily from about half an amp. You only need more if you are using power hungry peripherals. – joan Mar 9 '18 at 9:26
  • Thanks. I thought as much. It's just that the tutorial didn't explicitly mentioned powering the Pi separately. Then I got confused when I saw the Pi flickering to life from the connection to the battery pack – sisko Mar 9 '18 at 18:54

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