https://ukhas.net/wiki/ 2026-04-29T22:07:54+00:00 https://ukhas.net/wiki/ https://ukhas.net/wiki/lib/tpl/dokuwiki/images/favicon.ico text/html 2020-06-27T23:02:01+00:00 Anonymous (anonymous@undisclosed.example.com) https://ukhas.net/wiki/dbrooke_nodes:db04?rev=1593298921&do=diff This AVR Sensor Board V3 node has all components and headers installed and has a DHT22 as the sensor. The antenna is a 1/4 wave wire. It is running from 3 AA NiMH cells installed in a battery holder salvaged from a time expired CO detector. The battery voltage reading appears to not suffer from thermal error despite having 4M7 and 1M resistors in the ADC divider. text/html 2020-06-27T23:02:01+00:00 Anonymous (anonymous@undisclosed.example.com) https://ukhas.net/wiki/dbrooke_nodes:dbag?rev=1593298921&do=diff Adding Ethernet support to the Sensor Board V3 Background Some sort of network connection is required for a gateway and I had previously used a serial connection between a gateway node and a Raspberry Pi before connecting a radio module directly to the Pi for my text/html 2020-06-27T23:02:01+00:00 Anonymous (anonymous@undisclosed.example.com) https://ukhas.net/wiki/dbrooke_nodes:dbcg?rev=1593298921&do=diff This AVR Sensor Board V3 node has been built using a different voltage regulator, together with modified values for the battery sense resistor divider, to allow it to be powered directly by the car battery. It has a bi-directional serial connection to the existing car PC and zombie mode is entered (by sensing the 5V supply from the USB serial lead via a resistor divider) when the PC is not running. text/html 2020-06-27T23:02:01+00:00 Anonymous (anonymous@undisclosed.example.com) https://ukhas.net/wiki/dbrooke_nodes:dbd1?rev=1593298921&do=diff This AVR Sensor Board V3 node has all components and headers installed and has a DHT22 as the sensor. The antenna is a 1/4 wave wire. It is running from 3 AA alkaline cells installed in a battery holder salvaged from a time expired CO detector. The housing is an off the shelf ABS box which, although not intended to be waterproof, is reasonably sealed and has a recess at the bottom which provides some shelter to the otherwise exposed DHT22 sensor. text/html 2020-06-27T23:02:01+00:00 Anonymous (anonymous@undisclosed.example.com) https://ukhas.net/wiki/dbrooke_nodes:dbdg?rev=1593298921&do=diff This LPC812 (EtnaNode v1.0) node was originally built for software development and therefore is equipped with push buttons for Reset and ISP entry. It is fitted with a voltage regulator so that it can be powered by the 5V supply from the USB serial lead and also has a DS18B20 temperature sensor which was originally fitted to test the 1-wire interface. It was subsequently deployed as a gateway in Disley since it happened to be available at the time of a visit there. text/html 2020-07-10T18:56:46+00:00 Anonymous (anonymous@undisclosed.example.com) https://ukhas.net/wiki/dbrooke_nodes:dbpg?rev=1594407406&do=diff Raspberry Pi with directly connected radio module Hardware The RFM69HW and optional BMP085 modules are mounted on a Slice of Pi board. The BMP180 sensor uses the same protocol as the BMP085 and has also been tested. Connection Summary Raspberry Pi Pinout RFM69HW