Version No.:1. 0 Grove Oxygen Sensor Pro SKU: 101020912 Features: Application: * High sensitivity and Accuracy to toxic gas * Portable gas detector * Long life, low power consumption * Fixed gas alarm and detector * Good stability * UART and analog voltage signal output GGC2330 is a general-purpose and high-performance gas module with electrochemical gas sensors. It uses three electrodes, electrochemical gas sensor and high-performance micro-processor. By installing different gas sensor, the module could detect relevant gas. It is with built-in temperature sensor to make temperature compensation, which makes it could detect the gas concentration accurately. It has the digital output and analog voltage output at the same time which facilities the usage and calibration and shorten the development period. It is a combination of mature electrochemical detection principle and sophisticated circuit design, to meet customers different detection needs. Dimensions: Tolerance: 0.25mm Unit: mm Specification: Item Specification O2 Target Gas Measurement Range Refer table 2 Operating Voltage 50.1V DC Operating Current 5 mA UART(TTL electrical Level, 3V) Output Analog voltage(refer table 2 for sensor original amplifying signal) Operating Conditions -2025/1590%RH(no condensation) Storage Conditions -2050/1590%RH(no condensation) Size 23.5mm*24.5mm Life Expectancy 2 years(in air) Measurement Range and signal output Table 2 Target Gas O2 Measurement Range 0-25%VOL Resolution 0.1 %VOL Output in the Air(V0) 1.5-0 V Response Time(T90) 15S Pin definition Pin Function GND Ground VCC Power supply VO Voltage output RXD Serial port input TXD Series port output Bottom view Unit: mm Communication Protocol 1. Setting Item Parameter Baud rate 9600 8 Data bits 1 stop bit check bit no 2. Communication Specification The default communication type is active upload and it sends gas concentration every other one second (the concentration is 16 hexadecimal). Send 0x78 command to change communication type. After changing the communication type to 0x04 (Q&A type), only by receiving the 0x86 command (reading concentration value command), current concentration value can be sent. The recommended communication period is 1 second.