https://ukhas.net/wiki/ 2026-04-19T08:56:56+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/ideas:adafruit_lipo_charger?rev=1593298921&do=diff Notes on Adafruit Lipo Charger * Currently being used on the AH6 node. * During the winter there is little light to power the solar panel and so the battery is used to power the node. The onboard LEDs continue to be powered even when the battery voltage is unable to sustain the node. text/html 2020-06-27T23:02:01+00:00 Anonymous (anonymous@undisclosed.example.com) https://ukhas.net/wiki/ideas:aprs_rx?rev=1593298921&do=diff APRS Rx Aim * Add APRS rx capabilities to UKHASnet node * Forward APRS data over UKHASnet Components * Baofeng UV-3r+ * Arduino Mini Pro 5v * LPC810 * RFM69HW Details * Use BeRTOS decoder to decode APRS * Outputs via Serial to LPC810 which will forward on the data over UKHASnet text/html 2020-06-27T23:02:01+00:00 Anonymous (anonymous@undisclosed.example.com) https://ukhas.net/wiki/ideas:esp8266?rev=1593298921&do=diff ESP8266 Hardware The ESP8266 is a cheap WiFi SoC. It should allow us to make gateway nodes which do not require a PC to upload to the internet. Out of the box the module can be controlled via AT commands at 57600 baud serial. I found controlling it using an AVR to be a bit sketchy at this speed, but worked better at 9600 baud after updating the SoC firmware. It runs at 3.3v and needs a reasonable supply (240mA peak during tx, 70mA idle). text/html 2020-06-27T23:02:01+00:00 Anonymous (anonymous@undisclosed.example.com) https://ukhas.net/wiki/ideas:gps_survey_node?rev=1593298921&do=diff GPS Survey Node I needed a simple portable node that would repeatedly broadcast its location using a connected GPS so I could make range measurements. Hardware I used a Moteino board with an RFM69HW RF unit and uBLOX Max 8 breakout board. The uBLOX serial connects via a sofwareSerial using Arduino pins 3 and 4. text/html 2020-06-27T23:02:01+00:00 Anonymous (anonymous@undisclosed.example.com) https://ukhas.net/wiki/ideas:lipo_solar?rev=1593298921&do=diff Charging Lithium Batteries from Solar Panels As many have discovered, conventional charging ICs do not manage to charge batteries with low light, while manage fine in strong light. This is due to the constant current nature of the panel which varies with the light intensity, and so when the current output of the panel is below what the charger want to put into the battery, the charger will fail to function. text/html 2020-06-27T23:02:01+00:00 Anonymous (anonymous@undisclosed.example.com) https://ukhas.net/wiki/ideas:new_settings?rev=1593298921&do=diff Experiments with new Radio Settings THIS IS A WORK IN PROGRESS Settings Baudrate Current Settings: 2kbps Proposed Settings: 2kbps { RFM69_REG_03_BITRATE_MSB, 0x3E}, // 2 kbps { RFM69_REG_04_BITRATE_LSB, 0x80}, Deviation Current Settings: text/html 2020-06-27T23:02:01+00:00 Anonymous (anonymous@undisclosed.example.com) https://ukhas.net/wiki/ideas:rfm69_frequency_trimming?rev=1593298921&do=diff RFM69 Frequency Trimming For optimum performance all the nodes in your network need to be working on the same frequency. The RFM69’s have automatic frequency control but that has a limited range. This guide shows you how to trim the frequency of the RFM69s. text/html 2020-06-27T23:02:01+00:00 Anonymous (anonymous@undisclosed.example.com) https://ukhas.net/wiki/ideas:solar_lantern?rev=1593298921&do=diff Solar Lantern Node Aim * Convert a solar lantern to run a UKHASnet node * Cheap source of solar parts * Allows stealth deployment of nodes * Waterproof container Gardman Stainless Steel Solar Light Parts * YX8018 Transistor * Inductor - 33uH (orange,orange, black (though does look purple)) text/html 2020-06-27T23:02:01+00:00 Anonymous (anonymous@undisclosed.example.com) https://ukhas.net/wiki/ideas:temp_management?rev=1593298921&do=diff RFM69HW Temp Management Idea 1: Crystal Oven Components * RFM69HW * Moteino or another micro * 2 Resistors (10ohms) * Mosfet Design * 2 resistors in parallel lying over the RFM69HW crystal acting as heaters * Mosfet is used to connect the resistors to ground (they are connected to VCC as well) to complete the circuit and heat up the crystal.