I am going to update my wifitank to a better platform
Dimensions (mm): 200x170x105
but the battery from my old is a 9.6V ni-cd from a drill, which is close to perfect, because it is a good voltage for both the motors and the arduino, it can power the entire thing for 3-4 hours with more or less constant use, plus it can be recharged in about 20 minutes with the original charger, but the problem is the weight and size of it.
To get the battery on the platform, it will be at the very end to make room for the servo that will hold the camera, and make it very unevenly balanced.
I am now trying to find something that will be about as powerful, but smaller.
Only thing I can think of here is li-po, but only thing I know about those is that they need the right right charger, otherwise they could become dangerous.
I have tried the lipo rider form seeedstudio, and it is quite nice, but only charges with max 500mA and can only output 5V and 350mA
The 5V would be usable for the arduino, but it is only just enough to make the motors turn, and with the 350mA it would then probably drop to something that wouldn't make them run.
Maybe I could use multiple lipo riders to bring the current up, but it would still charge the batteries very slowly.
Anyone got any ideas on what I could use?
Total sensors and so on the tank is 2 servo motors 4 proximity sensors 2 ping sensors 4 motors for the wheels ~8 leds for night driving 1 seeeduino mega 1 wishield 2.0 1 h-bridge motordriver 1 wireless camera (around 200ma)
I haven't tested how much current the new platform will draw (still waiting for it to arrive), but the old one I used was pulling around 2A while starting both motors at the same time, then around 500mA with both of them continuous spinning afterwards