Society of Robots - Robot Forum
Electronics => Electronics => Topic started by: frank26080115 on November 07, 2007, 03:43:36 PM
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Cheap dollar store batteries work better with my sensors than Duracell batteries, but Duracell can give me a lot more torque, but my floor sensor and front sensors won't work with it... Why would that be?
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take a voltage reading of both batteries... are there any differences?
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it was a stupid mistake i made, forget it
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Well at least post what it was for others to reference :)
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I strongly recommend buying the more expensive rechargeable batteries like NiMH types . . . they will save you tons of money (since you never need to buy them again), save the environment (since you rarely need to throw them away), and they hold a much better charge and release energy much faster . . . ;D
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ok I have 4 phototransistors at the front of my sumo robot, 2 for seeking and 2 for line detection, there are also 3 emitters, before I had all the ground wired up together, but the circuit wasn't efficient and I switched to a better method for range detection, i connected the ground to a MOSFET and my MCU operated the MOSFET so i take one base line reading and compare it to a new illuminated reading, but soldering the GROUND wire to the MOSFET made it so that my sensors didn't have a real ground, and if voltage is too high, my ADC will only tell me 1023, I don't know why it appeared to work with a crappy battery...
I hope I fixed it, I had to clip the wires connecting the sensor to the emitters, and add in another wire for an actual ground connection
I actually have a 3000mAh 7.2V Ni-MH but it wouldn't fit on this robot, I don't wanna buy another small one just to suit this project.
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You should get a 6V pack, I use them all the time because most servos cannot go higher than 6V (without reducing their lifespan).
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I read somewhere that RC racing people use 7.2V batteries with servos and have no problems, I never had issues either.
A 6V would mean getting LDO regs and the local store don't have those (and my charger is only 7.2 and 9.6 volts)
I can get samples from ST within 3 days though lol
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yea servos will work at 7.2V, with a higher rpm and torque too . . . but this causes overheating and faster gear wear, causing the servo not to last as long . . .
plus, 6V is more efficient than 7.2V (for a long list of reasons) . . . but yea if you don't have an LDO then you will have other probs . . .