SocksWarmerVoltageControl

Overview

Simple voltage control for electric socks warmer which features:

• linear voltage control with desired steps within designated range
• user interface by lever switch (power on/off & voltage control)

Supported Boards

• Seeeduino XIAO
• Seeed XIAO RP2040

Supported Devices

• CAT5171 digital potentiometer (wiper)
• MP1584 DC/DC converter

Ciruit Diagram

PDF

Pin Assignment

common for Seeeduino XIAO and Seeed XIAO RP2040

Pin No.	Pin Name	Net Name	Description
1	D1	PIN_EN	MP1584 EN
2	D2	PIN_UP	Lever Switch Up
3	D4	PIN_DN	Lever Switch Down
4	SDA	SDA	CAT5171 I2C SDA (pulled-up with 10Kohm from 3.3V)
5	SCL	SCL	CAT5171 I2C SCL (pulled-up with 10Kohm from 3.3V)
6	D6	PIN_CT	Lever Switch Center
7	D7	PIN_PWM	PWM output (when PWM drive usage)
9	D9	PIN_MOTOR	Vibration Motor Control
11	3V3	3V3	3.3V out
12	GND	GND	Ground
13	5V	5V	5.0V in from USB Battery

How to build in Arduino

• append the URL of Seeduino Boards Manager JSON file in: File > Preferences > Additional Boards Manager URLs.

https://files.seeedstudio.com/arduino/package_seeeduino_boards_index.json

Seeeduino XIAO

• select Tools > Board > Boards Manager as Seeeduino XIAO

Seeed XIAO RP2040

Arduino RP2040 library needs to be re-generated since it doesn't include hardware_sleep object at default. To update this, you need to prepare Developer Command Prompt for VS 2019 and Visual Studio Code on Windows enviroment. See "Getting started with Raspberry Pi Pico" .

• modify %USERPROFILE%\AppData\Local\Arduino15\packages\Seeeduino\hardware\rp2040\1.9.3\pico-sdk\src\rp2_common\pico_stdio\stdio.c

(add static not to coflict posix.c)

//int _read(int handle, char *buffer, int length) {
static int _read(int handle, char *buffer, int length) {
...

//int _write(int handle, char *buffer, int length) {
static int _write(int handle, char *buffer, int length) {
...

• modify %USERPROFILE%\AppData\Local\Arduino15\packages\Seeeduino\hardware\rp2040\1.9.3\tools\libpico CMakeLists.txt

cmake_minimum_required(VERSION 3.12)

set(PICO_SDK_PATH ${CMAKE_CURRENT_LIST_DIR}/../../pico-sdk) ##### Add this #####
include(pico_sdk_import.cmake)
include(pico_extras_import.cmake)
...
target_link_libraries(pico 
...
	pico_audio
	pico_audio_i2s
	hardware_sleep ##### Add this #####
)

# comment below
#add_custom_command(TARGET pico POST_BUILD
#	COMMAND ar d libpico.a stdio.c.obj stdio_usb.c.obj stdio_usb_descriptors.c.obj
#)

• Launch Visual Studio 2019 -> Developer Command Prompt for VS 2019

> cd %USERPROFILE%\AppData\Local\Arduino15\packages\Seeeduino\hardware\rp2040\1.9.3\tools\libpico
> mkdir build
> cd build
> cmake -G "NMake Makefiles" ..
> nmake

Then replace build\libpico.a with %USERPROFILE%\AppData\Local\Arduino15\packages\Seeeduino\hardware\rp2040\1.9.3\lib\libpico.a

• Modify %USERPROFILE%\AppData\Local\Arduino15\packages\Seeeduino\hardware\rp2040\1.9.3\lib\platform_inc.txt

...
-iwithprefixbefore/pico-extras/src/common/pico_util_buffer/include
-iwithprefixbefore/pico-extras/src/rp2_common/pico_audio_i2s/include
-iwithprefixbefore/pico-extras/src/rp2_common/pico_sleep/include        ##### Add this #####
-iwithprefixbefore/pico-extras/src/rp2_common/hardware_rosc/include     ##### Add this #####
...
-iwithprefixbefore/pico-sdk/src/rp2_common/hardware_resets/include
-iwithprefixbefore/pico-sdk/src/rp2_common/hardware_spi/include
-iwithprefixbefore/pico-sdk/src/rp2_common/hardware_rtc/include         ##### Add this #####
-iwithprefixbefore/pico-sdk/src/rp2_common/hardware_sync/include
...

• Then at Arduino, select Tools > Board > Boards Manager as Seeed XIAO RP2040

Customize

Parameter Name	Description
vRangeMin	lowest voltage of the range
vRangeMax	highest voltage of the range
numLinearPos	the steps in the range (e.g. set 11 to have steps 0 ~ 10)

Control Guide

• plug-in USB to power-on and output lowest voltage within designated range
• long push of Center button to power on/off
• push up button to step up the voltage
• push down button to step down the voltage
• long push down button to output lowest voltage within designated range

NeoPixel Indicator (Seeed XIAO RP2040 only)

• 1times dimming when change voltage level or power on
• 2times blink to power off
• Color indicates voltage level: Blue (lowest) --> Geen (midium) --> Red (highet)