{"id":5673,"date":"2024-12-16T13:57:26","date_gmt":"2024-12-16T12:57:26","guid":{"rendered":"https:\/\/home.et.utwente.nl\/slootenvanf\/?p=5673"},"modified":"2025-09-19T14:39:10","modified_gmt":"2025-09-19T12:39:10","slug":"data-logging-raspberry-pi-pico","status":"publish","type":"post","link":"https:\/\/home.et.utwente.nl\/slootenvanf\/2024\/12\/16\/data-logging-raspberry-pi-pico\/","title":{"rendered":"Data logging with the Raspberry Pi Pico W"},"content":{"rendered":"\n

This tutorial extends the tutorial of a temperature sensor with a display<\/a>, and adds data logging to that. This can be realized by logging to an SD card (part 1), by logging to a website (via Wifi) (part 2) or by logging to the memory of the Raspberry Pi (part 3).<\/p>\n\n\n\n

Part 1: Data logging to a microSD Card<\/h2>\n\n\n\n

First, create a temperature sensor with a display<\/a>. This part of the tutorial adds logging the temperature and humidity to a CSV file<\/a> on a microSD card to that.<\/p>\n\n\n\n

Insert an sdcard in a microSD Card Adapter Module<\/a>:<\/p>\n\n\n\n

\"\"<\/a><\/figure>\n\n\n\n

Connect the module:<\/p>\n\n\n\n

Module pin<\/strong><\/td>Raspberry Pi Pico pin<\/strong><\/td><\/tr>
CS <\/strong>(chip select)<\/td>GPIO 17<\/td><\/tr>
SCK<\/strong> (serial clock)<\/td>GPIO 18<\/td><\/tr>
MOSI<\/strong> (master out slave in)<\/td>GPIO 19<\/td><\/tr>
MISO<\/strong> (master in slave out)<\/td>GPIO 16<\/td><\/tr>
VCC<\/strong><\/td>VBUS (5V)<\/td><\/tr>
GND<\/strong> (ground)<\/td>GND<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Please note that we moved the signal wire of the temperature sensor and connected that to GP15!<\/strong> (it was on GP16 in the temperature sensor tutorial).<\/p>\n\n\n\n

\"\"<\/a><\/figure>\n\n\n\n

If you did not install MicroPython on the Raspberry Pi Pico yet, do so. Also install the Thonny editor<\/a> (incl. Python). For details see the tutorial of the temperature sensor<\/a>.<\/p>\n\n\n\n

Install the sdcard<\/strong> and ssd1306<\/strong> libraries (In Thonny, via Tools > Manage Packages<\/em>):<\/p>\n\n\n\n

\"\"<\/a><\/figure>\n\n\n\n

Next, download and open the example Python file dht11_display_datalogger_sdcard.py<\/a><\/strong> in Thonny. Connect the Pico with the USB cable. Run the code.<\/p>\n\n\n\n

If all goes well, it should start logging data to the card (check that in the Shell in Thonny).<\/p>\n\n\n\n

After a while, unplug the USB cable. Extract the sdcard and plug it in your computer (or use a card reader). Check the file sdtest.csv, open it with a text editor, to view its contents.<\/p>\n\n\n\n

More information:<\/h2>\n\n\n\n