[DigiKey "Smart Creation, Non-stop Happiness" Creative Competition] BADGER 2040+DS1302 Clock

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[DigiKey "Smart Creation, Non-stop Happiness" Creative Competition] BADGER 2040+DS1302 Clock [Copy link]

 

DS1302 is a low-power real-time clock chip. The real-time clock calculates the year, month, day, hour, minute, second, and day of the week until the year 2100, and has a leap year adjustment function. The number of days per month and leap year can be adjusted automatically. The clock operation can be determined by the AM/PM indication to use a 24-hour or 12-hour format. The DS1302 and the microcontroller can simply communicate in synchronous serial mode, which requires three communication lines: 1. CE enable line; 2. I/O data line; 3. SCLK serial clock line;

In the module routine of BADGER 2040, there is a clock demonstration module made with internal RTC, but the data will be lost after power failure. Here I use the external DS1302 module to try communication and display the clock on the screen. After the experiment, it was successful. Here I share the information and links suitable for beginners to quickly get started.

Quick reference for the RP2 — MicroPython latest documentation

A Concise Python Tutorial (nxez.com)

The DS1302 module used looks like this.

1. Hardware Connection

The VCC pin of the clock module is connected to 3V of RP2040.
The GND pin of the clock module is connected to GND of RP2040.
The CLK pin of the clock module is connected to SCL of RP2040.
The DAT pin of the clock module is connected to SDA of RP2040.
The RST pin of the clock module is connected to INT of RP2040.

2. Programming
First save the following code on Pico, name it DS1302.py, then create a main.py file and save it and run it

This is the main.py file. It can also display the temperature of the RP2 chip on the screen.

The effect shown is as shown in the figure

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Install a GPS module for more accurate time acquisition

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The accuracy of DS1302 is a bit low, so it is better to use DS3231, which has its own high-precision crystal and temperature compensation, and the I2C interface is more convenient.