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Automated machine to help breaking in mechanical keyboard switches

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misterkeebs/switch-breaker-controller

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Switch Breaker

BOM

Disclosure: All the links that start with s.click are affiliated links, they help me develop the project further. Thank you!

Switch Breaker

SKU Description Qty Sample URL
12V Motor 1 https://aliexpress.com/item/32777233870.html
THSL-300-8D 8mm Lead T8 Rod with Brass Nut 1 https://aliexpress.com/item/32977298147.html

Controller board

SKU Description Qty Sample URL
NodeMCU NodeMCU ESP8266 V2 or V3 Development Board 1 https://aliexpress.com/item/32264218680.html
MCP23017 GPIO Expander 1 https://s.click.aliexpress.com/e/_9J0zGB
L293D 12V Motor Driver 1 https://s.click.aliexpress.com/e/_At8ePZ
L7805CV 12v to 5v Regulator 1 https://s.click.aliexpress.com/e/_AKwbDD
Heatsink for L7805CV 1 https://s.click.aliexpress.com/e/_Ag238R
DIP16 DIP16 Socket for L293D 1 https://s.click.aliexpress.com/e/_9xRmen
DIP28-narrow DIP28 Narrow Socket for MCP23017 1 https://s.click.aliexpress.com/e/_9xRmen
PCB Mount DC Power Jack 1 https://s.click.aliexpress.com/e/_AAFHht
12v 1A+ Power Supply 1 https://s.click.aliexpress.com/e/_99O4l9
10k Resistor 1 https://s.click.aliexpress.com/e/_A0ad3H
12+ Pins Female Header 1

I/O Board

SKU Description Qty Sample URL
SSD1331 0.96" 96x64 SPI Full Color OLED Display 1 https://aliexpress.com/item/32958447200.html
KY-040 Rotary Encoder with PCB 1 https://aliexpress.com/item/1005001621899401.html
Push Button 1 https://aliexpress.com/item/4000864332254.html
12+ Pins Ribbon Cable 1 https://aliexpress.com/item/1005002281766539.html
12+ Pins Male Pin Headers 1

Connections

docs/connections.jpg

From I/O Board Cable

Right to left on the diagram above

Pin Description Target Target Pin
1 Ground NodeMCU GND
2 3.3/5V NodeMCU Vin
3 OLED SCK NodeMCU D5
4 OLED SDA NodeMCU D7
5 OLED RST NodeMCU D6
6 OLED DC NodeMCU D8
7 OLED CS NodeMCU D0
8 Rotary SW (Switch) mcp23017 GPA7
9 Rotary DT (Data) mcp23017 GPA6
10 Rotary CLK (Clock) mcp23017 GPA5
11 Push Button mcp23017 GPA4

From NodeMCU

Pin Description Source Source Pin
Vin 5V or 3.3V Input L7805CV 5V
IO Cable 2
GND Ground L7805CV GND
IO Cable 1
D0 OLED DC IO Cable 7
D2 I2C SCL (Clock) mcp23017 SCL
D3 I2C SDA (Data) mcp23017 SDA
D5 OLED DC IO Cable 3
D6 OLED RST IO Cable 5
D7 OLED SDA IO Cable 4
D8 OLED DC IO Cable 6

From mcp23017

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Automated machine to help breaking in mechanical keyboard switches

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