8 Channel 18-bit Analog to Digital Differential Converter for Raspberry Pi
Description
- 8 x 18-bit differential inputs
- Control via the Raspberry Pi I2C port
- Stack up to 4 ADC Differential Pi boards on a single Raspberry Pi
- Jumper selectable I2C addresses
- Buffered 5V I2C port
The 8 Channel 18-bit Analog to Digital Converter for Raspberry Pi is an 8 channel 18 bit analog to digital converter designed to work with the Raspberry Pi. The ADC Differential Pi is based on two Microchip MCP3424 A/D converters each containing 4 analog inputs. The MCP3424 is a delta-sigma A/D converter with low noise differential inputs.
The ADC Differential Pi is powered through the host Raspberry Pi using the GPIO port and extended pins on the GPIO connector allow you to stack the ADC Differential Pi along with other expansion boards.
- Vdd (5V pin on I2C bus): 5.0V
- All AD inputs and outputs: VSS–0.4V to VDD+0.4 V
- Current at Input Pins: ±2 mA
- I2C SDA/SCL voltage: 5.0 V
- I2C port current: 100 mA
- Based on the MCP3424 from Microchip Technologies Inc
- Input range of ±2.048V
- On-board 2.048V reference voltage (Accuracy ± 0.05%, Drift: 15 ppm/°C)
- On-Board Programmable Gain Amplifier (PGA): Gains of 1, 2, 4 or 8
Programmable Data Rate Options:
- 3.75 SPS (18 bits)
- 15 SPS (16 bits)
- 60 SPS (14 bits)
- 240 SPS (12 bits)
J'en ai commandé 6 jusqu'à présent, j'en ai essayé plusieurs en raison de mes propres problèmes de câblage, mais ils fonctionnent très bien - je les utilise avec des capteurs piézo pour capter les vibrations.
J'avais besoin de mesurer six pressions de vide différentes à l'aide de capteurs de pression de la série 26PC SMT de Honeywell. Comme les sorties du sesnor sont faibles à 50 mV sur toute la plage de pression de 0 à 1000 hPa (avec une source d'alimentation 5 V), j'avais besoin d'un convertisseur analogique-numérique haute résolution multicanal pour obtenir une mesure précise. Avec une entrée ADC maximum d'environ 5 V, un ADC 12 bits me donnerait une résolution d'environ 24 hPa, ce qui n'était pas suffisamment précis. J'ai donc choisi le CAN 18 bits qui me donnerait une résolution de mesure de 0,02 mV ou 0,4 hPa. J'ai reçu le paquet et il comprenait le PCB ADC et le connecteur 40 broches vers Raspberry Pi. Le connecteur doit être soudé sur le PCB par vous-même, ce qui peut être difficile si vous n'avez pas les bons outils et / ou l'expérience. J'ai connecté l'ADC au Raspberry Pi et téléchargé les scripts à partir du référentiel ABElectronics Github. J'ai testé des scripts Python et C et j'ai reçu des mesures des capteurs. Les scripts s'adaptent facilement à vos besoins. L'ADC a répondu à mes attentes et je suis très satisfait de ce produit.
J'ai regardé à travers ce genre de chapeau pour raspberry pi pour mesurer le signal du capteur. C'est mignon et facile à manipuler en programmation, aussi. Cela correspond vraiment à mon objectif.
I looked through this kind of the hat for raspberry pi for measuring the sensor signal. It's cute and easy to handle in programming, too. It's really fitting to my purpose.
I've ordered 6 of these so far, I've tried several due to my own wiring issues but they work great - I use them with piezo sensors to pick up vibrations.
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