Hi,
I am making a small robot and want to select the battery that gives me the most prolonged use at the lowest price and fits into the smallest space allowable. It only needs to power the drive mechanism and no micro controllers etc.
I have already made the mechanical parts of the robot (e.g., gearing).
When I run the robot with a lab power supply, the wheels turn as I would like from 3V, showing as 130mA. When I resist the rotation with my physical strength, it goes up to around 230 mA. If I increase the voltage, the wheels spin faster, but I don't think I need this (although it would be allowable if it offers some advantages related to the above points). From observing it, I can see that anything above 5V would be too fast for what I need.
The motor was taken out of an sg-90 servo. I think it is a 5V motor, but I could be wrong. This motor is used because I have a lot of them on hand, so it is convenient for me to use them rather than buy another. For this practical reason, the choice of the battery should be selected to fit this specific motor.
I got some cheap CR2032 3V lithium cells from a local discount store (pack of 20 cost me €5). I can't see a mAh rating on the packaging. From Google, my understanding is that it is typically around 225 mAh. These are very cheap batteries, though, so I don't know if that would also apply to these batteries or more premium versions of the CR2032. The robot motors do not turn with one coin cell, but it does with two coin cells placed on top of each other.
The motors spin for about 30 seconds, then the robot motors sound like they are struggling, and it stops shortly after. I thought that the batteries had run out, but if left for a few minutes, the process can be repeated. I can see that the voltage goes back up. Do you know what the issue could be? If they are 225 mAh each and my robot only draws 130mA, should it not run for several hours?
If I used a 3V regulator, would this increase the runtime, or would it just add inefficiency and unnecessary cost?
Do you have any other suggestions about how I might be able to increase the runtime?
I might also use AAA batteries instead, but the rechargeable versions are pretty expensive for what I need. The CR2032 has a rechargeable version called the LIR2032, and I am thinking of using those if I can increase the runtime to at least 10 mins of use. I can see that these are also very cheap.
Many thanks for your help
I am making a small robot and want to select the battery that gives me the most prolonged use at the lowest price and fits into the smallest space allowable. It only needs to power the drive mechanism and no micro controllers etc.
I have already made the mechanical parts of the robot (e.g., gearing).
When I run the robot with a lab power supply, the wheels turn as I would like from 3V, showing as 130mA. When I resist the rotation with my physical strength, it goes up to around 230 mA. If I increase the voltage, the wheels spin faster, but I don't think I need this (although it would be allowable if it offers some advantages related to the above points). From observing it, I can see that anything above 5V would be too fast for what I need.
The motor was taken out of an sg-90 servo. I think it is a 5V motor, but I could be wrong. This motor is used because I have a lot of them on hand, so it is convenient for me to use them rather than buy another. For this practical reason, the choice of the battery should be selected to fit this specific motor.
I got some cheap CR2032 3V lithium cells from a local discount store (pack of 20 cost me €5). I can't see a mAh rating on the packaging. From Google, my understanding is that it is typically around 225 mAh. These are very cheap batteries, though, so I don't know if that would also apply to these batteries or more premium versions of the CR2032. The robot motors do not turn with one coin cell, but it does with two coin cells placed on top of each other.
The motors spin for about 30 seconds, then the robot motors sound like they are struggling, and it stops shortly after. I thought that the batteries had run out, but if left for a few minutes, the process can be repeated. I can see that the voltage goes back up. Do you know what the issue could be? If they are 225 mAh each and my robot only draws 130mA, should it not run for several hours?
If I used a 3V regulator, would this increase the runtime, or would it just add inefficiency and unnecessary cost?
Do you have any other suggestions about how I might be able to increase the runtime?
I might also use AAA batteries instead, but the rechargeable versions are pretty expensive for what I need. The CR2032 has a rechargeable version called the LIR2032, and I am thinking of using those if I can increase the runtime to at least 10 mins of use. I can see that these are also very cheap.
Many thanks for your help