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operations:temphumidmonitor_hardware
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operations:temphumidmonitor_hardware [2019/03/26 01:36] Jim Lovell [Connections for the DHT22 sensors] |
operations:temphumidmonitor_hardware [2019/04/03 23:22] (current) Jim Lovell [Connections for the DHT22 sensors to the RJ45 bus] |
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| 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}} |
| 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: | 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: | ||
| + | ^ 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.1553564210.txt.gz · Last modified: 2019/03/26 01:36 by Jim Lovell
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