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STD DHT22 SPI Driver
No Profile
License: MIT
Description
Circuit to drive the DHT22 temperature and humidity sensor via the SPI bus.
The advantage is, that it uses next to no CPU resources as everything runs in hardware on most platforms.
This allows a multitaking OS like Linux to reliably read the sensor without issues.
TESTED WORKING
Design Drawing
schematic diagram
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PCB
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| ID | Name | Designator | Footprint | Quantity |
|---|---|---|---|---|
| 1 | 1u | C-DHT22 | CAP-D8.0XF3.5 | 1 |
| 2 | SD101CW-E3-08 | D1,D2 | DO-35 | 2 |
| 3 | Header-Male-2.54_2x4 | P-SPI | HDR-4X2/2.54 | 1 |
| 4 | BSS138 | Q1,Q2 | SOT-23(SOT-23-3) | 2 |
| 5 | 33k | R-DHT | AXIAL-0.3 | 1 |
| 6 | 10k | R-DHTCE-PU,R-MISO-PU | AXIAL-0.3 | 2 |
| 7 | DHT22 | S1 | DHT22_AM2303_VERT | 1 |
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