I have a number of weather stations in service for monitoring hang gliding sites via Weather Underground which are unattended and use either WiFi, 4G or Ethernet to connect to the web. Depending on situation, they run the same basic code apart from the communications support, but this is running on either Arduino or ESP8266 hardware. I have an innate distrust of software reliability (or should I more correctly say, of my ability to design a 100% uptime unattended system using consumer MCU’s) including relying on the internal watchdog of the MCU, so all these variants use a 5 minute hardware watchdog to reset everything as a last resort if things go so pear shaped I can’t otherwise recover. I’ve been using the simple Freetronics 4-pin watchdog but it’s been discontinued - and I’ve got none left.
Freetronics publish the schematic and .brd files on their site so I’m wondering if anyone has bitten the bullet and duplicated the design and/or has boards they can supply. Alternatively I could build a gigantic version on stripboard using a DIP 555., not keen though…. (If anyone’s done that and optimised the layout, I’d also be interested!)
Thanks for any assistance.
John
*note: The stations using this are very reliable indeed.
