Have'nt yet maybe tomorrow coz its night time here. Ill give you an updtae on how I will solve it if ever. I have an idea using LM7805 a voltage regulator. My friend used a voltage regulator and it went well.
Have'nt yet maybe tomorrow coz its night time here. Ill give you an updtae on how I will solve it if ever. I have an idea using LM7805 a voltage regulator. My friend used a voltage regulator and it went well.
1. How far it would be proper to drive BD436/436 transistors from thr port pins of PIC16F884 without even base current limiting resistors?
2. Whether the PIC cant be tried at 4.5V which is amounts to use three cells
3. After somuch extensive circuitry and anticipated load current , perhaps it would be appropriate to use a 6V lead acid battery of 2 or 3AH capacity and try using LDO regulator for supplying the PIC.
3. After somuch extensive circuitry and anticipated load current , perhaps it would be appropriate to use a 6V lead acid battery of 2 or 3AH capacity and try using LDO regulator for supplying the PIC.
google cd754410 or l293d same pinout. The l293 might be easier to find, it'll work with small dc motors up to 600ma (the cd745510 will handle 1.2a)
Carbon Zinc batteries have a much different discharge curve than NiMH. Plus NiMH AA are about 1.2v per cell so four will give you 4.8v fully charged.
google cd754410 or l293d same pinout. The l293 might be easier to find, it'll work with small dc motors up to 600ma (the cd745510 will handle 1.2a)
Carbon Zinc batteries have a much different discharge curve than NiMH. Plus NiMH AA are about 1.2v per cell so four will give you 4.8v fully charged.
All said, for a robot project, it is preferabale to go for high capacity and light weight batteries as these have to be carried on the body of the robot. As such perhaps two li-ion celles in series may be better provided re-charging system could be managed.
Li-Ion cells are somewhat expensive and require an exotic charger to keep from exploding. They hate being abused and a short might anger them (see explode, fire etc...)
NiMH are common and more forgiving.
PS the OP seems to be having a difficult time giving up on the Carbon Zinc cells.
Li-Ion cells are somewhat expensive and require an exotic charger to keep from exploding. They hate being abused and a short might anger them (see explode, fire etc...)
NiMH are common and more forgiving.
PS the OP seems to be having a difficult time giving up on the Carbon Zinc cells.
There are fresh cells named 'ZIC CHLORIDE CELLS" and these give better discharge rates. they are generally used for photography at nominal cost -- unlike Duracells.