张小哥

HaaS100 expansion board-2021

Overview

Onboard hardware resources:

24V to 12V module interface x1
12V non-isolating switch x1
24V non-isolating switch x1,
12V/24V optional isolation relay x1
OLED interface compatible with SPI and I2C x1
3.5mm audio interface x1
Micro button x3
5.5mmx2.1mm DC interface x1
Self-restoring fuse x1
Terminal x2
PH2.54 socket

| >Note: The actual Rev1.2 silk screen SCL (I2C) and CLK (SPI) are in the wrong position and should be interchanged.

The correct silk screen printing is as follows:

Note: To use the SPI0 interface, just short-circuit CLK and MOSI. To use I2C, you need to short SCL and SDA and solder the I2C pull-up resistors R12/R13.

The picture below is a demonstration of using SPI0 to light up OLED:

Design Files

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Update:2025-06-24 20:40:33

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