This is my first post and my first project with the ssc32, so sorry in advance if I miss anything out.
I’ve been creating a biped robot using the ssc32. I’ve been adding another voltage regulator for another circuit that uses the same power input and whilst I was doing that, the vs1 negative wire touched the positive input from the battery. Vs1 at the time was linked to vl and now the board doesn’t seem to power on.
Does anyone have any ways I can test for a dud board?
Sounds like a short of just the battery, unless you melted a trace on the board.
Do you get LEDs lit when you apply a fresh 9V battery to VL? Do you have a DVM or multi-meter? Check for 9V first on the VL, and then for 5V on the 5V side of the VS/5V selection pins of the output pin set (2,3,4,5) .
If you get the above, then go on to check the VS. Connect up a 6V battery to VS inputs, and check for 6V on the VS side of the VS/5V selection pins of the pin set again.
I’ve tested the battery, it’s a 7.5v the multimeter gives the correct reading. However if I put the multimeter on a 5v side, it shows as 0v so I’m not sure where to go from here. Any other ideas?
7.5v is a little low for a 9V battery, but it should operate the regulator. Resistance at the battery clip (battery disconnected) should be about 35K.
Is the 5v line still shorted? Can you measure the resistance between the 5v rail and ground (battery disconnected)? Should be over a Mohm (DMM). If it’s shorted, you probably fried the regulator.
My battery is rated at 7.5v so that’s normal for my setup. I tested the tx and got 6.3 volt from it. Where as before the short, I was getting around 4.5. This said, the power from the tx used to light up the raspberry pi it’s connected to, but no longer does.
Upon further inspection of the ssc32, i noticed what looks like damage on the underside of the vl positive contact, could this be a problem?
The short between vs1 negative and the battery positive is no longer there, the circuit only shorted for about 200ms.
I will test the resistance this afternoon. I’ve a lot to do today so won’t have much time until then.
Thanks for your help so far, I really appreciate it.
6.3v on the tx pin? The group jumpers should typically be set up for 5v for tx/rx, PS2 and other TTL interfaces. Your servos get the VS, or 6V. 6.3V on a power pin (5v selected) also suggests a failed regulator.
Replacing the regulator and repairing the trace I’d suspect the board would work. The processor chip is on a socket, and rarely fails anyway. That leaves the FTDI USB chip. Hopefully it didn’t get fried.
Thanks for your help.