DFRobotSKU:RB-Dfr-485
Número de fabricante:
SEN0159
3 reviews
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Descripción
Primer sensor de CO2 en el mercado de OSHW
Módulo sensor y potenciómetro MG-811 de alta sensibilidad a bordo
Circuito de condicionamiento para amplificar la señal de salida
Interfaz: Analógico
El Sensor de CO2 Compatible con Arduino es el primer sensor de CO2 en el mercado OSHW. La tensión de salida del módulo disminuye a medida que aumenta la concentración de CO2. El potenciómetro a bordo está diseñado para establecer el umbral de voltaje. Siempre que la concentración de CO2 sea lo suficientemente alta (el voltaje es menor que el umbral), se liberará una señal digital (ON/OFF). Tiene un módulo de sensor MG-811 a bordo que es altamente sensible al CO2 y menos sensible al alcohol y al CO, baja humedad y dependencia de la temperatura. Todos los componentes tienen calidad industrial lo que significa estabilidad y reproducibilidad.
El circuito de calefacción a bordo brinda la mejor temperatura para que funcione el sensor. La potencia de entrada de 5V aumentará a 6V para calentar. Este sensor tiene un circuito de acondicionamiento a bordo para amplificar la señal de salida.
Caracteristicas
• Una salida digital
• Conector de alta calidad
• Superficie de oro de inmersión
• Circuito de calefacción a bordo
• Voltaje de operación de 5V
very sensitive and precise sensor it is fed in + 5v but read with CAN (ads1015) for Raspberry in 3.3v. price a bit high
D
Doreen
You're on your own for calibration
The unit is calibrated via defining thresholds in your code, but it's a trial-and-error process, and you really need a second (already calibrated) CO2 sensor to establish your baselines. For the price, this should be pre-calibrated to 400ppm at the factory. As Graham said, it's good for detecting short-term spikes/drops in CO2 (even after a 48-hour burn-in period). But that's about it.
G
Graham
Drifts like crazy
Having attached the CO2 sensor to an Arduino Uno with the output writing to an LCD display, I have been monitoring the voltage output by the sensor over the last 10 days. It started out at about 3.25V (after amplification on the board) and has now drifted up to 3.75V indicating a significant decrease in CO2 levels below the assumed starting point of 400ppm. Even with accurate calibration, such a significant drift makes the sensor all but useless to do anything but monitor short term changes in CO2 levels. However, it is possible that the sensor requires significant burn in, and that the output will stabilise in the end. It is still pretty sensitive to short term changes to CO2 levels and reacts quite strongly to a single breath and to CO2 from a soda stream machine
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