battletank

Summary

battletank, based on the miniplan tanks, but with a esp32 mini, steering through Dabble (bluetooth) and tires instead of tracks. Program is attached. I made two of them (different turret, different color).
Parts:

• esp32 mini
• L293d motordriver ic
• N20 motors (used 150 rpm here)
• DFplayer mini
• miniature speaker
• L7805 voltage regulator
• common cathode RGB led
• mini servo
• any IR receiver
• IR led
• Brick tires
• axle adapters (https://nl.aliexpress.com/item/1005005339860882.html)
• 7.4 V li-ion battery
• some capacitors and resistors (Voltage regulator and LED)
• 2n3904 transistor to amplify IR signal (see schematics)
• 10K resistor to pullup GPIO35 on the esp32
• a small on/off switch
• power inlet (battery charge)
• epoxy glue to secure the motors and battery
• hotglue to secure wiring
• a little piece of felt (on of those self-adhesive furniture thingys)

Attention points:

• a lot of wiring in a cramped place, so keep your wires as thin and short as possible.
• it is advised to work out the wiring in advance, mine looks a bit too much like spaghetti.
• advise is to remix it so the esp32 can be programmed from outside (:))
• make sure the turret can move freely after assembling.
• a lot of parameters can be adjusted according to what you want. Program is still WIP.
• a common 1 transistor amplifier is used to amplify the ir sender. I used a 2n3904; any npn will do.
• the df player mini uses two wires of wich one has a resistor on one of the lines. (unlike the miniplan tank) and uses hardwareserial. (see the ino file, softwareserial didn't work on the esp32)