Smoking base shield

#1

I tried to use a 10.5 volt battery to power my base shield, but when I plugged it in there was a small puff of smoke. What did I do wrong?

#2

I cut the plug off a wall adapter power supply. The battery was a rechargeable from an old drill.

#3

That should be fine in theory? There’s a diode on the input of the 2.0 baseshield that will protect against wrong polarity:
https://www.makeblock.cc/me-base-shield-v2-0-schematic/ but I presume you connected it as Center-positive if anything happened. Do you know if it’s a 1.0 o 2.0 version og the shield?

You sure the battery was 10.5V? Normal voltages for charged Lipo batteries depend on the number of cells: 1S = 3.7V, 2S = 7.4V, 3S = 11.1V & 4S = 14.8V.
If the battery is a 14.8V that just was discharged a bit when you measured it, it could of course be the problem?

J

#4

@BridgerWild, I’m afraid the TB6612 is burnt out (the dc motor driver chip). @jenschr is right, the polarity might be wrong.

@jenschr, in for the schematic of Baseshield 2.0, the power supply of TB6612 is “V-M”. You can see that in the pictures below. So I think the diode SS34 can protect the Baseshield except the TB6612.

#5

That makes sense. The motor drivers appear to be the only thing that are not working. I will check the polarity. I’m sure that’s what happened.

#6

I have found a 6 v DC motor with an encoder that I would like to use with the makeblock base shield. The specs say it has a stall current of 5.5A. Is it compatible? I don’t want to smoke another shield.

#7

As you can see in the schematic below, the port M1 and M2 have over current protection. But the Port1 and Port2 don’t. It would be safe if you connect the encoder to M1 and M2.

The Schematic of Me-Base Shield v2.0.zip (24.6 KB)

#8