Old 16-channel remote control excavator with limit switches and interchangeable attachments (A1 mini compatible)

I'm Chinese, and both the links for purchasing accessories and the BOM list are from websites based in Mainland China. If you can't access them, you'll need to figure out a solution by yourself. If you require paid electronic documents, you can obtain them by exchanging three boosts and leaving your email address.

A minor upgraded version has been released, quickly check it out at the other link...https://makerworld.com.cn/zh/models/1461503-16tong-dao-yao-kong-wa-jue-ji-zhua-mu-ji-cha-che-s#profileId-1591218

Below is the detailed accessories list: if you find it troublesome, you can also click this link to directly purchase the complete set of electronic accessorieshttps://m.tb.cn/h.h8T5nUI?tk=PjzT4cgRDix

Accessory Type	Quantity	Parameter Requirements	Reference Image
Remote Control Module (Original board discontinued)	1 set	Purchase link: https://h5.m.taobao.com/awp/core/detail.htm?ft=t&id=971339919726
N20 Lead Screw	3	M4*45mm, 6v, 1500 rpm
N20 Gear Motor	3	Low speed, high torque, below 100 rpm at 6v
Servo Motor	2	SG90 (180 degrees) Can be omitted if no attachment or bulldozer blade is used
Battery	1	3.7v, PH2.0 connector, black and red reversed wire sequence (can manually change wire sequence if not consistent)
	1	7.4v dual-cell, PH2.0 connector, black and red reversed wire sequence (can manually change wire sequence if not consistent), the key is voltage and connector, more cells mean higher cost and larger capacity, choose yourself
Slip Ring	1	Search for 'Guren conductive slip ring' on Taobao Outer diameter 6mm, 8 channels 1A
Micro Switch	6
Diode	6	1N4001
Dupont Wire	6p	Male to female, 40cm long (as servo extension cable)Can be omitted if no attachment or bulldozer blade is used
PH2.0 Connector	12	2p, 10cm long, 9 male pins, 3 female pins
7.4v Charging Module	1	Type-C port, 2 series, 1A or 2A
M2 Screws	≥32	M2*8, countersunk self-tapping screws
Total

The angle and speed of the servo motors need to be set in the remote control board program. You can ask the seller to set them before shipping, or if you understand microcontrollers and embedded languages, you can set them yourself. In short, with this remote control board set, it can be played directly once assembled.Additionally, if only the basic excavator functions are needed without attachments or a bulldozer blade, two servo motors and Dupont wires can be omitted without affecting the basic functions.