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PS2 Gamepad Receiver × micro:bit (MakeCode extension)

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The universal I2C edition of the PS2 Gamepad Receiver works with BBC micro:bit V1 / V2 through the MakeCode extension pxt-mbc-sensors v2 (which speaks MBC I2C protocol v2). Installation and hardware notes (3.3 V, power): micro:bit overview.

SPIKEEV3Arduino I2CmBlockMATRIXmicro:bit

Important

Extension v2 is not yet verified on hardware; block names follow the published release: https://github.com/contactmbcrobot/pxt-mbc-sensors

Wiring

PS2 Gamepad Receiver × micro:bit
Sensor micro:bit
SDA（RX） P20
SCL（TX） P19
VCC micro:bit 3V (external 5 V recommended on batteries)
GND GND

Reporter blocks

Block Returns Id Meaning
gamepad buttons bit mask 0~65535 bit 01 all 16 buttons in one word (PSX order, 1 = pressed): bit0 SELECT, 1 L3, 2 R3, 3 START, 4 Up, 5 Right, 6 Down, 7 Left, 8 L2, 9 R2, 10 L1, 11 R1, 12 Triangle, 13 Circle, 14 Cross, 15 Square; 0 when not connected
gamepad [d-pad] buttons (0-15) 0~15 bit 02 Up 1, Right 2, Down 4, Left 8 (added when pressed together), 0~15; 0 when not connected
gamepad [shapes] buttons (0-15) 0~15 bit 03 Triangle 1, Circle 2, Cross 4, Square 8 (added when pressed together), 0~15; 0 when not connected; high nibble of 0x22 'R'
gamepad [shoulders] buttons (0-15) 0~15 bit 04 L2 1, R2 2, L1 4, R1 8 (added when pressed together), 0~15; 0 when not connected
gamepad [functions] buttons (0-15) 0~15 bit 05 SELECT 1, L3 2, R3 4, START 8 (added when pressed together), 0~15; 0 when not connected; high nibble of 0x22 'G'
gamepad is connected 0~1 06 1 = gamepad connected (psx.read() succeeds), 0 = not; while disconnected all buttons read 0 and sticks are centred
gamepad battery percent 0 % 07 0~100; PS2 pads report no battery → always 0 (PS4 only)
gamepad trigger [L2] analog 0~255 08 L2 pressure 0~255 (only DualShock 2 in analog mode reports pressure; otherwise pressed = 255, released = 0); 0 when not connected
gamepad trigger [R2] analog 0~255 09 R2 pressure 0~255 (same rule as 08); 0 when not connected
gamepad type 0~2 0B 0 none, 1 PS2 digital mode, 2 PS2 analog mode (3 PS4 / 4 PS5 only appear on the PS4 receiver)
gamepad joystick [left X / left Y / right X / right Y] -100~+100 10~13 10 LX, 11 LY, 12 RX, 13 RY: −100 to +100, 0 = centre, right / up positive (raw 0255 with ±7 dead zone); 0 when not connected. EV3 / SPIKE / MATRIX carry 099 (50 = centre) or 1~9 (5 = centre), see each platform

More blocks (yes / no, events)

Block Related value
gamepad button [cross] is pressed 01
on gamepad button [cross] [pressed] 01

Command blocks

Block Id Meaning
gamepad rumble strength 200 E5 [strength 0~255], 0 = stop; the PS2 receiver ACKs and ignores it (pad rumble disabled since 250614), effective on PS4 only
gamepad light bar colour #ff0000 E6 [R][G][B] 0~255 each; PS2 pads have no light bar, the receiver ACKs and ignores it, effective on PS4 only

Status

bit Name Meaning
b0 ready (ready) always 1
b1 gamepad connected (connected) same as value 06

JavaScript

if (!(mbc.waitReady(0x42, 3000))) {
    basic.showIcon(IconNames.No)   // nothing answers: check wiring and power
}
basic.forever(function () {
    basic.showNumber(mbc.padButtons())   // 16 buttons
    basic.pause(100)
})

Sources and assumptions

Generated by _build/gen-reference.mjs from _build/protocol/ps2.json (single source of truth, transcribed from the 2026-10-21 protocol decisions).

  • hw[0] = 1（PS2）、電量 07 恆 0、系統鍵 0A 恆 0、手把類型 0B 只會出現 0／1／2（I2C 定案 §2、§4）。
  • 08／09 L2／R2 類比照定案寫 0~255：DS2 類比模式有壓力值；沒有壓力值時按下 = 255、放開 = 0（沿用 v1 0x14 的做法，盤點 .ino:598-603）。
  • E5 震動、E6 燈條照 I2C 定案 §3 列在 PS2／PS4 共用命令表；PS2 收到回 ACK 後忽略（跟 v1 0x10／0x23 一樣）。
  • 搖桿 1013 在 I2C／mBlock 是 ±100（由 raw (v−128)×100/128、Y 上為正）；EV3／0x22 維持 099（50 中間）、SPIKE 維持 1~9（5 中間）照盤點，不改鎖住模式。
  • EV3：模式 0、1、2、4 鎖住（照盤點）；模式 3 改 方向|形狀<<4|已連線<<8（原本沒有 bit8）；模式 5 改成 ID 格式 B（原本 = 按鍵／搖桿合併版）。
  • SPIKE：0/5/7/9 鎖住，1、2、4、6 維持不動；模式 3 改 [已連線, 電量(0), 0]（原本 = 4 組按鍵）；模式 8 改 v[0] = ID|hw[0]<<8（原本 = 搖桿）。模式 9 v[6] button16 = PSX 排列（D3）。
  • SPIKE 模式 5 只容得下 11 鍵（L2、R2、L3、R3、START 讀不到），鎖住不改。
  • The extension reads Int16LE and pauses 2 ms after writing the id (D5); with no sensor answering, reporters return 0 and yes / no blocks return false.
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