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Vision Sensor (WRO Edition, HUE12) × micro:bit (MakeCode extension)

Back to Vision Sensor (WRO Edition, HUE12)

The universal I2C edition of the Vision Sensor (WRO Edition, HUE12) 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

Vision Sensor (WRO Edition, HUE12) × micro:bit
Sensor micro:bit
SDA（RX） P20
SCL（TX） P19
VCC must use external 5 V (share GND with the micro:bit)
GND GND

Reporter blocks

Block Returns Id Meaning
camera spot [1~12] colour code 0~255 10~1B 101B = colour code of spots S1S12: 0239 colour (hue 0255 scaled to 0239), 240245 white (saturation < 30, lower = larger), 246~250 black (value < 30, darker = larger), 255 = spot not enabled
camera spot [1~12] vividness 0~255 20~2B 202B = vividness (saturation) of spots S1S12, 0~255: black = 1, white/colour = actual saturation; 0 when the spot is not enabled

More blocks (yes / no, events)

Block Related value
camera spot [1~12] is [colour] 10~1B

Status

bit Name Meaning
b0 ready (ready) always 1; b1 = 0 (the WRO edition has no 'blob found')

JavaScript

if (!(mbc.waitReady(0x4C, 3000))) {
    basic.showIcon(IconNames.No)   // nothing answers: check wiring and power
}
basic.forever(function () {
    basic.showNumber(mbc.camSpotColor(1))   // spot 1~12 colour code
    basic.pause(100)
})

Sources and assumptions

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

  • hw0 = 2（共識 #6：神攝手 2 = WRO 版）；model = HUE12（樂高模式名）。
  • I2C 0x4C 與學校版同一位址（主機用 F0 高 byte 1／2 分辨）；D4：SDA = IO3、SCL = IO1，與 EV3／SPIKE 串口模式二選一編譯；ESP32 從機 onReceive 預載 32 B；上機待測。mBlock 用 Serial.begin(38400, SERIAL_8N1, 3, 1)。
  • 值表只有 101B、202B（mBlock 定案）；兩群各 12 個，I2C 一次連續讀 12 個值（24 B）剛好一群。
  • EV3／SPIKE 只有一個模式 HUE12（type 95，動態描述表 DATA32×8），鎖住照盤點 §0-2 排法；沒有 ID 模式（type 95 只宣告 1 個模式，不加）。
  • mVision 鎖住照盤點 §4：[0xAA][9][18 B][xor]，byte 011 顏色碼、1217 鮮豔度 4 bit；WRO 隊伍的 HUE12_AS_mVisionSensor_v1.0.8.mbr4 在用，不動；B-6：不節流（每圈 loop 送）。
  • mVision 的鮮豔度是 S>>4（015），值表 202B 是完整 0~255；兩者不同是既有設計，不改。
  • 顏色碼 255 只代表「色點沒開」，不代表「沒找到」（沒抓到時仍回種子點顏色，盤點 §0-1）。
  • 不做 0x22（hosts.matrix = false）；沒有寫入命令；F3 只有 b0。
  • 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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