Hi,
A simple i2c driver for the Microchip’s TCN75A thermometer – supports up to 8 thermometers. Driver works in one shot mode which is suitable for battery powered operations. The chip is with quite good specs for its price.
Code at github esp_i2c_tcn75a .
Usage: checkout user/user_main.c for example usage.
Enjoy!
73
After a lots of lots of wasted hours debugging an I2C driver it came out that the noise from the connected cheep USB2TTL converter is way too much. Would have lost months without the help of the new DS1054z scope i’ve got.
So i came up with this – a simple UDP debugging.
Simple socket to send udp messages.
Call dbg_udp_start(0) and you are ready to go. If you prefer not to flood your LAN with debug messages broadcasts then instead of 0 provide your workstation IP address.
I’ve got a new tool at the LAB!
The Box: 
The Tool: 
Having an oscilloscope is just priceless. You may need it rarely but there are times when you are just lost blind without it. The video lists all you should now about it and a bit more
If you are considering to get one and you are in EU. I can recommend Silcon.cz – you will get a nice service there.
In case you’ve missed it! Kicad is going to get some really nice features!
When repairing stuff with a motor the first question is:
“Is it the motor or is it the board that failed?”
For a recent Inverter Air Conditioner board repair the following tool helped to answer that question.
The circuit can act as Induction Motor aka asynchronous motor .
Inverter Air Conditioners which use AC motors take the 220V from the grid and turn them into about 150V three phase AC which drives the motor.
While working on a current project i’ve faced an issue with code reuse. Espressif sdk allows only one interrupt handler for all GPIOs. That’s fine for monolithic code but since we like modular code a dispatcher comes handy.
The little inconvenience i’ve had was like this. I wanted to use the drivers/key.c code but it does use the data argument , so i’ve had to modify it to use a global variable. So i can call it from my own interrupt handler. And that is ugly.
$ open devlog
I’ve back imported footprints for a .cmp file and I’ve misunderstood kicad’s question about the imported footprints visibility, so all went visible.
And surprise, you can not edit visibility for all fields at once.
So little utility was born – fixvis.
Usage is pretty simple:
./fixvis file.sch fieldid newval
where fieldid is:
0 - Reference
1 - Value
2 - Footprint
3 - Datasheet
4+ - custom
newval: 0000 = visible, 0001 = hidden
Spend last weekend trying to make apache with proxy_wstunnel to work.
The solution recommended is to add this in the apache config:
ProxyRequests off
ProxyPass /mqtt ws://127.0.0.1:8082
ProxyPassReverse /mqtt ws://127.0.0.1:8082
But no matter what it is a no go. So, where is the problem?
It’s the libwebsockets it doesn’t understand custom http headers X-… but apache adds some.
To add support for them in the file lextable-strings.h append before the blank string :
“x-forwarded-server”,
“x-forwarded-for”,
“x-forwarded-host”,
The esp8266 chip is made by Espressif Systems.
ESP8266 is a highly integrated chip designed for the needs of a new connected world. It offers a complete and self-contained Wi-Fi networking solution, allowing it to either host the application or to offload all Wi-Fi networking functions from another application processor.
The chip have both certifications FCC and CE. You can sell your products to the mass market.
Here you will read about the latest research and development at the lab.
I follow the latest trends in technology with bias to the Open Software and Hardware.
