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Arduino pro-mini et programmation par ICSP

Details
Last Updated: 03 February 2025
Hits: 1216
usbasp promini wiring   Petit tuto pour programmer un Arduino Pro-mini en ICSP avec un programmateur USBASP 2.0

Dans certains cas, il peut être nécessaire de programmer un Arduino via le port ICSP.
Par exemple, si le microcontrôleur a été remplacé par un neuf, si par mégarde le bootloader a été corrompu ou effacé, si le programme injecté est corrompu et qu'il n'y a plus d'accès via le port USB ou le connecteur FTDI, si le logiciel est distribué au format HEX, si on n'a plus accès au microcontrôleur via le port USB, etc...

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Tiny APRS LoRa WX station

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Last Updated: 30 June 2025
Hits: 4006
tiny wx station

Having gained some experience with my weather station project described in the APRS LoRa weather station article, and having a few LoRa RFM95W modules, I decided to carry out a feasibility test for a very low-power mini weather station.

The initial results were very encouraging, so I continued my project until I had a mature design.

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LoRa modules test softwares

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Last Updated: 29 December 2023
Hits: 4487
 TX spectrum

Lilygo LoRa modules from Lilygo are advertised to provide a power output of +20dBm (100mW).
Having had a module that looked suspicious, I was faced with the problem of measuring power.
Measuring the power of a fugitive signal such as LoRa is not always easy.

So I wrote a little script that makes it easy.
I also wrote a second script to test reception sensitivity.

I found that none of my modules reached the advertised power, which was more like +17dBm.

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APRS LoRa weather station

Details
Last Updated: 14 December 2024
Hits: 16120
TK5KP 13 zoom Description of a versatile weather station.
Features :
- Built around a TTGO T3 LoRa 433 MHz module
- Sensors for temperature, pressure, humidity, rainfall, wind speed and direction.
- Protocols: APRS via LoRa, APRS-IS, MQTT and Wunderground via WiFi.
- Wifi with DHCP or static address
- OLED display with or without screensaver.
- Password-protected OTA updates.
- Web server with all datas.
- LoRa fallback if WiFi or Internet fails
- etc...

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Tracker CD2RXU LoRa APRS

Details
Last Updated: 22 December 2024
Hits: 23850
cd2rxu tracker display 

 This article is no longer relevant. The software has evolved considerably and no longer requires programming.
This is done online via a Web interface. It does, however, provide some interesting informations.

CD2RXU's LoRa APRS Tracker software is a fork of OE5BPA's, to which he has added functionalities.
It brings several improvements over the original software, including :
- a menu offering a choice of functions
- choice of different callsigns (and icons, e.g. TK5EP-9 car, TK5EP-7 runner, etc.)
- the ability to view the reception of other Trackers
- reduced power consumption by lowering CPU speed
- compression of transmitted data to reduce transmission time, thus reducing power consumption and improving reception immunity
- local weather report request, etc...
To take advantage of certain functionalities, you also need to use his iGate software.

Read more …

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