schematic for dfrobot beetle

[rozzers]

Hi All,
I would be grateful for advice on the schematic in this tiny_bot_project

there is a BOM & schematic tabbed on the ArduinoCreate files linked above.
the BOM has links to most of the components. For Clarity an image is included with this post.

What I am most interested in is the power supply . I know the schematic is missing a power switch and there should be a cap across the motors for protection, but before i put this together and let some magic smoke out of the beetle or IR sensor I would be grateful for advice on how the two 3v7 600mA batteries are divided and whether the generated 7v4, 5V and 3v3 supplies will amply supply the beetle, L293 & FC-51 IR sensor.

Tiny_bot_cct_image

thanks in advance for taking time to look at this design

rozzers

[Railroader]

That will not be a reliable diagram. 5.0 resp. 3.3 volt should not be generated that way. Use buck converters, not a resistor ladder.

For better use of energy, swap out the stone age K293, and use MOSFET drivers.

[jremington]

Yes, get rid of the resistors. A voltage divider cannot produce a regulated voltage.

Apply the 7.4V to the Leonardo Vin. The Leonardo 5V output can be used for the motor driver logic if needed, and for other circuits if the current draw is less than 200 mA or so.

Use a modern motor driver (best selection here). Be sure to pick a motor driver that can easily handle the stall current of your motors.

[rozzers]

Hi Railroader,
thanks very much for the advice. I will implement buck converters.
regards
Rozzers