Hi, I just completed my first project( an object avoiding robot that use a UNO R3, l293d shield and ultrasonic sensor). I powered it with 3 9v batteries but eventually had to power it with my laptop. My hypothesis is that this is due to inefficiency in the motor driver, and use of trash batteries. Can you recommend any good motor drivers that fulfill the following criteria -
-> Available in Amazon in India
-> Runs 4 Bi-directional DC motors (Yellow TT motors 3-12V)
-> Not from Pololu or aliexpress
-> Complete module, not merely an IC
-> Cheap ( less than 500 INR)
I figured, but do I need to upgrade the motor shield or only the batteries. Like if I ideally had a proper set of batteries, would it work without a problem
The voltage made available to the motor will be 3V or so less than the supply voltage.
These things are used by many 'hobbyists' - they're adequate on that level even if they aren't the best of the best. Get a holder with capacity for 6-8 'AA' or 'C' cells.
@runaway_pancake Is there a rechargeable option, since replacing batteries often tends to go heavy on the wallet. I tried Li ion, but the first battery I ordered melted the charger, the second came without a charger, the charger I later ordered was so messed up that it did not charge the batteries after 3 to 4 hours
Yes, sure - it's voltage and mAh (milliamp-hours).
You recounted a list of difficulties. In Li-ion terms, you're looking for a '3S' and, I suppose, one that comes with a charger.
Another option is NiMH, available in 'AA', 'C' packages. Eneloop is a good brand, so is Amazon_Basic.
I use an L298N H-bridge Module along with a rechargeable Lithium-Ion battery(12v, 1200mAh) and it works fine, though the battery's output reduced to 11v over time and couldn't power the module. The Module works in 12v-24v range.
The module has most likely 16volt caps on Vmot, so about 12volt is the limit.
12volt is also in the danger zone for an Uno if you leave the V-in jumper on.
Leo..