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operations:temphumidmonitor_hardware
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operations:temphumidmonitor_hardware [2019/03/25 21:51] Jim Lovell [Hobart and Yarragadee] |
operations:temphumidmonitor_hardware [2019/04/03 23:22] (current) Jim Lovell [Connections for the DHT22 sensors to the RJ45 bus] |
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| These sites have a Raspberry Pi located in the antenna with DHT22 temperature and humidity sensors attached. They are also equipped with a 4-channel 12-bit analog to digital (ADC) board so that up to 4 analog signals could be monitored if needed. The DHT22 sensors are connected together on a bus that uses RJ45 connectors and CAT5 cables to daisy-chain up to 6 sensors from a single RJ45 connection. | These sites have a Raspberry Pi located in the antenna with DHT22 temperature and humidity sensors attached. They are also equipped with a 4-channel 12-bit analog to digital (ADC) board so that up to 4 analog signals could be monitored if needed. The DHT22 sensors are connected together on a bus that uses RJ45 connectors and CAT5 cables to daisy-chain up to 6 sensors from a single RJ45 connection. | ||
| - | The Raspberry Pis have an Adafruit Perma-Proto HAT to manage the wiring and to mount the ADC. Here's what it looks like (no RJ45 connector attached): | + | The Raspberry Pis have an Adafruit Perma-Proto HAT to manage the wiring and to mount the ADC. Here's what it looks like (no RJ45 connector attached):{{ :hardware:img_1404.jpg?direct&200 |}} |
| * {{:hardware:thschematic.pdf|Schematic of the connections (PDF)}}. Links to details on the hardware: | * {{:hardware:thschematic.pdf|Schematic of the connections (PDF)}}. Links to details on the hardware: | ||
| Line 67: | Line 67: | ||
| * [[https://www.adafruit.com/product/1083|ADS1015 12-Bit ADC - 4 Channel with Programmable Gain Amplifier]] | * [[https://www.adafruit.com/product/1083|ADS1015 12-Bit ADC - 4 Channel with Programmable Gain Amplifier]] | ||
| - | ==== Connections for the DHT22 sensors ==== | + | ==== Connections for the DHT22 sensors to the RJ45 bus ==== |
| The DHT22 has 4 pins but pin 3 is not used. | The DHT22 has 4 pins but pin 3 is not used. | ||
| - | {{ :hardware:dht22-pinout.png?direct |DHT22 pinout}} | + | {{ :hardware:dht22-pinout.png?direct%300 |DHT22 pinout}} |
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| + | Each one requires a connection to power and ground plus a unique GPIO port on the Raspberry Pi for data. The RJ45/CAT5 has 8 wires. Two are reserved for power and earth so that leaves 6 for sensors. The RJ45 terminal blocks have a different wire colouring to the CAT5 cable. Here's how they are allocated: | ||
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| + | ^ RJ45 Pin number ^ CAT5 wire colour ^ RJ45 terminal block wire colour ^ GPIO# or power assignment ^ ID on unit ^ | ||
| + | | 1 | orange/white | grey | 4 | TH1 | | ||
| + | | 2 | orange | orange | 17 | TH2 | | ||
| + | | 3 | green/white | black | 18 | TH3 | | ||
| + | | 4 | blue | red | +3.3V | | ||
| + | | 5 | blue/white | green | GND | | ||
| + | | 6 | green | yellow | 27 | TH4 | | ||
| + | | 7 | brown/white | blue | 22 | TH5 | | ||
| + | | 8 | brown | brown | 23 | TH6 | | ||
/home/www/auscope/opswiki/data/attic/operations/temphumidmonitor_hardware.1553550710.txt.gz · Last modified: 2019/03/25 21:51 by Jim Lovell
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