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This is the repo for me and my friends 3lb meltybrain

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Unschuled dissasembly a 3lb "meltybrain" combat robot

This is a 3lb combat robot that me and luke have designed. this is a special type of robot thats way more complcated then normal bots, normal bots just have normal wheels and then the spinning weapon right well this bot is the weapon, the two hugely overpowered motors act as drive motors set to spin oppisite directions from eachother so the enitre 3lb mass of the robot is the weapon for a greater moi and impact. this can be achieved by using a microcontroller like a arduino nano or in my case a adafruint itsybitsy 32u4 and hooking it to the reciever and allowing it to act as a controller for the motor escs instead of the reciever and what is then does is edit the pwn that the escs get to allow translational drift to happen which is when even when the entire robot is spinning at 5000 rpm it can still go in a mostly stright line.

About this project

This project includes a custom pcb for all the wiring of motors, escs, adafruit and the accelerometer. the pcb also acts as a power distrubution board which i struggled with for a while because of the amount of power going throught it, the back pads of the escs are going to be filled with solder to help conduct the electricity better and allow for more heat disspation. all the vias are also going to be filled to the brim with solder. i also created a reverse polarity protection circuit for the electronics other then the escs using a mosfet. the weapons are going to be made out of ar500 steel for the strength to weight ratio. the pcb is going to cost extra because it has to be 2oz copper, this was a fun and painful project to learn how to make pcbs on. i know buying spares of parts is frowned opon but its the same price without the spare weapon, i also left the carbon fibre out of the bom because theres not enough time to get it quoted.

image ![image]((https://github.com/user-attachments/assets/e3d63fd0-bcd0-43ad-b4bb-83c2c03d85d0) 471334013-767f2554-9c21-4e59-9d07-b84de258acd2 image image
Parts Amount Cost Total Cost Weight Total Weight Provider
Drive/Weapon motor 2 $34.59 $69.18 156 312 HobbyKing PROPDRIVE v2 3542 1250KV Brushless Outrunner Motor
ESC 2 $30.00 $60.00 13.9 27.8 Amazon HGLRC Specter 90A 8S BLheli32 Single ESC
Battery 1 $62.99 $62.99 370 370 Amazon OVONIC 4S LiPo Battery 3500mAh 14.8V 130C
Reciever 1 $5.67 $5.67 0.9 0.9 Aliexpress FS2A 4CH AFHDS 2A
Power switch 1 $12.50 $12.50 3 3 Repeat Robotics Lynx Anti-Spark Switch
xt90 connector 1 $12.99 $12.99 18 36 Amazon xt90 connector
Buck Converter 1 $3.55 $3.55 3.85 3.85 Amazon Micro voltage regulator
N-Channel mosfet 1 $2.23 $2.23 negligible negligible Aliexpress N-Channel Enhancement-Mode MOSFET Transistor 60V 115mA,SOT-23.
Accelerometer 1 $25 $25 Unknown Unknown Adafruit Adafruit H3LIS331 Ultra High Range Triple-Axis Accelerometer
Pin headers 1 $1.68 $1.68 negligible negligible Aliexpress 40 pin Breakable Pin Header
P-Channel mosfet 1 $2.83 $2.83 negligible negligible Aliexpress SUM110P06-07L-E3 p channel mosfet
Blue LED 1 $ 3.68 $3.68 2.8 2.8 Aliexpress Clear blue LED Diode Lights
Zener Diode 1 $2.02 $2.02 negligible negligible Aliexpress 15v zener diode
Resistor set 1 $2.18 $2.18 negligible negligible Aliexpress 0805 Chip Resistor Assortment Kit
Ceramic Capacitor 47uf 1 $2.62 $2.62 negligible negligible Aliexpress 0805 47UF 25V X7R M
Electrolytic Capacitor 1 $3.64 $3.64 33 33 Aliexpress 4700uF 35V 18x30mm Electrolytic Capacitor
0.1UF Caps 1 $2.6 $2.6 negligible negligible Aliexpress
ATMEGA32U4-AU 2 $4.11 8.22 negligible negligible Aliexpress
22PF Caps 1 $2.6 $2.6 negligible negligible Aliexpress
Ceramic Capacitor 10UF 1 $2.62 $2.62 negligible negligible Aliexpress 0805 47UF 25V X7R M)
10NF Caps 1 $2.6 $2.6 negligible negligible Aliexpress
USB-C-PORT 1 $1.43 1.43 negligible negligible Aliexpress
USBLC6-4SC6 1 $0.84 $0.84 negligible negligible Aliexpress
Weapon 3 $10 $31 [SendCutSend]( ar500 steel weapon
PCB 1 $27.50 $27.50 [JLCPCB]( pcb for power distrubution and connections to mcu and escs
Body 1 $0.00 $0.00
$352.17 1175.95

source for code https://github.com/nothinglabs/openmelt2

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