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A macropad with an OLED display

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97830db · · Oct 24, 2025

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TrlPad

TrlPad is a 4-key macropad with a rotary encoder, an OLED display.

Features

  • 4 programmable mechanical keys (MX-style switches)
  • Rotary encoder with push-button for multi-function input
  • 0.91" 128x32 OLED dispvlay (SSD1306)
  • Powered by Seeed Studio XIAO nRF52840 (Bluetooth + USB)
  • Custom PCB

How it evolved

The initial concept

The design concept was to be something akin to a pedal effect. A sketch of what I thought it'd be:

concept-1.jpg

Final

Yeah, it's rather different but this is more feasible and it's simple yet punk-y.

image.png

PCB

Below is the schematic:

Schematic

Below is the PCB routing:

routing

Bill of Materials (BOM)

# Reference Value Footprint Qty Link Price (USD) Running Price (USD)
1 D1, D2, D3, D4 D Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal 4 AliExpress 1.41 1.41
2 D5 1N4148W Diode_SMD:D_SOD-123 1 AliExpress 1.95 3.36
3 R1 806k Resistor_SMD:R_0805_2012Metric 1 AliExpress 0.66 4.50
4 R2 2M Resistor_SMD:R_0805_2012Metric 1 AliExpress 0.48 4.50
5 SW1, SW2, SW3, SW4 SW_Push Button_Switch_Keyboard:SW_Cherry_MX_1.00u_PCB 4 AliExpress 1.01 5.51
6 SW5 RotaryEncoder_Switch Rotary_Encoder:RotaryEncoder_Alps_EC11E-Switch_Vertical_H20mm 1 AliExpress 0.63 6.14
7 TP1, TP2 TestPoint TestPoint:TestPoint_Pad_D2.0mm 2 6.14
8 U1 XIAO-nRF52840-SMD Modified:modified-XIAO-nRF52840-SMD 1 AliExpress 10.11 16.25
9 U2 128x32_OLED_S zzz_Project:SSD1306-0.91-OLED-4pin-128x32 1 AliExpress 2.24 18.49
10 Shipping costs for AliExpress check cart.png 3.05 21.54
11 3D Printed case check screenshot 3dCase_bill.png 3Ding 16.29 37.83
12 PCB from JLPCB, check screenshot jlcpcb.png 7.56 45.39

Total Estimated Cost: 45.39 USD

Note: I am trying to get the case 3D printed using #printing-legion, or if that doesn't work out, I'll cover the cost on my own!


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A macropad with an OLED display

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