產品說明1
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The Parallax ColorPAL combines an RGB LED, a light sensor, and a microcontroller to make a color sensor that can also be used as an ambient light detector and a color generator. Readings are reported via a 1-wire asynchronous serial interface.
ColorPAL是一種小型的顏色和光感測器，透過它的RGB LED，亦可作為辨識色彩時的產生器。
當檢測顏色時，ColorPAL使用其LED照亮樣本；一種色彩元素組成的時候，會隨著產生一種譜光，轉換到電壓轉換器來測量反射回來的光。從樣本反射的光量，分成紅色(R)，綠色(G)和藍色(B)三原色 來確定樣本的顏色。
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| ColorPAL side view. |
Overview
The ColorPAL from Parallax is a miniature color and light sensor that can double as a color generator with its RGB LED. When sensing color, the ColorPAL uses its LED to illuminate a sample one color component at a time while measuring the light reflected back with a broad-spectrum light-to-voltage converter. The amount of light reflected from the sample under illumination from each red, green, and blue LED can be used to determine the sample’s color. For the ColorPAL to detect the color of a subject, the subject must be reflective and non-fluorescent. The color of objects that emit light (e.g. LEDs) cannot be detected.
Features
- Detects a wide range of colors and outputs data as 10-bit RGB (Red/Green/Blue) components.
- Detects broad-spectrum ambient light with sensitivity down to 44µW/cm2 per lsb.
- Generates 24-bit color using onboard RGB LED.
- Plugs into servo headers or cables or solderless breadboards.
- Single-pin interface uses a simple serial protocol to define and initiate color detection and generation.
- Color detection and generation details handled by onboard microcontroller.
- Onboard EEPROM for saving custom color detection and generation programs.
- Autorun feature permits running a pre-designated EEPROM program with only a power supply.
檢測到全系列的顏色，輸出數據為 RGB（紅 /綠 /藍）組件。
檢測光譜環境光線的敏感性，44μW/cm2 per lsb。
24-bit 顏色 on board RGB LED。
3-pin杜邦接腳電纜插到伺服頭或直接插到麵包板。
板載上的微控制器處理顏色檢測與生成。
板載 EEPROM用於保存自定義的色彩檢測和生成項目。
Specifications
- Power requirements: 5.0 VDC
- Communication: 1-wire serial (asynchronous, non-inverted, open-drain serial protocol) with automatic baud rate detection from 2400 – 7200 bps
- Dimensions: 1.72 × 0.90 × 0.65 in (44 × 23 × 17 mm)
電源要求：5.0V
通訊：Serial 1-Wire (asynchronous serial, open drain)串列單接口
尺寸：44 × 23 × 17mm
Note：
本ColorPAL工作於非瑩光的反射面，最好是接觸在它的LED光罩。
Communication
Communication with the ColorPAL takes place using serial I/O, transmitting and receiving at between 2400 and 7200 baud, using a non-inverted, open-drain protocol. The ColorPAL includes a pull-up resistor to Vdd, so you do not need to apply one externally. Because of the open-drain protocol, the pin used to communicate with the ColorPAL should always be configured as an input, except when being driven low. Also, when starting up, you should wait for this pin to be pulled high by the ColorPAL before trying to send it any commands. Please see the user’s manual (297k pdf) for more information.
