soil_moisture_meter
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soil_moisture_meter [2015/01/06 17:36] – [Partlist (in buildup order)] breaker27 | soil_moisture_meter [2015/01/29 22:43] (current) – [Partlist (in buildup order)] breaker27 | ||
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| 1 | Transceiver PCB RFM12B | | 1 | Transceiver PCB RFM12B | ||
| 1 | IC 74HC14D | | 1 | IC 74HC14D | ||
- | | 1 | Connector AVR Mini ISP 6pin | JP1 | {{ parts:connector_isp.jpg }} | | + | | 1 | Connector AVR Mini ISP 6pin | JP1 | {{ parts:connector_mini_isp.jpg }} | |
| 1 | Connector pin header (for serial TX debugging etc.) | JP3 | | 1 | Connector pin header (for serial TX debugging etc.) | JP3 | ||
| 1 | Antenna (82,2mm wire) | ANT | {{ parts: | | 1 | Antenna (82,2mm wire) | ANT | {{ parts: | ||
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| 1 | Resistor 1M | R2 | | 1 | Resistor 1M | R2 | ||
| 1 | Resistor 100k | R3 | | 1 | Resistor 100k | R3 | ||
- | | 1 | + | | 1 |
===== Buildup of PCB ===== | ===== Buildup of PCB ===== | ||
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- Now connect a multimeter to **check the power consumption**. Press the button when the device starts up. The device will blink some seconds very fast and then go to power down mode. **The device should draw only ~0.1µA.** If the current is much higher, you may have a short circuit somewhere. | - Now connect a multimeter to **check the power consumption**. Press the button when the device starts up. The device will blink some seconds very fast and then go to power down mode. **The device should draw only ~0.1µA.** If the current is much higher, you may have a short circuit somewhere. | ||
- Solder the debug TX pin, the RFM12B module and antenna with a soldering iron as usual. | - Solder the debug TX pin, the RFM12B module and antenna with a soldering iron as usual. | ||
+ | - Switch on the device and check power consumption again. With connected RFM12, it should now be ~1.7µA. | ||
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soil_moisture_meter.1420562215.txt.gz · Last modified: 2015/01/06 17:36 by breaker27