Caffeinated AFTONSPARV

This small PCB replaces the original board inside your AFTONSPARV Planet lamp. It connects to your smart home setup via a common ESP32 firmware like esphome.io or WLED.

And the best thing, it’s all OSHW certified: DE000140

Instructions

Step 1: Remove the cover

Remove the bottom cover from the AFTONSPARV lamp, there is no need to open the top cover. Open the marked screws, there’s one under the sticker.

Step 2: Disconnect the wires

Carefully de-solder all wires from the old board, it is not needed anymore.

Step 3: Connect the PCB

Carefully solder the wires to the Caffeinated AFTONSPARV as shown below:

IKEA Lamp	PCB
LED, black	LED R
LED, green	LED G
LED, transparent	LED B
LED, white	LED +
Plug, white	POWER +
Plug, black	POWER -

See PinOut for more details

Step 4: Test

Connect the power and test the PCB. If nothing gets hot, you can measure 3.3V at the USB Port continue with the firmware installation

Step 5: Install firmware

Connect the ESP to your computer using the TagConnect or USB interface and install the firmware of your choosing. The button on the front is connected to IO9, the boot-mode selector^[1].

Important

The board must be powered with 24V to install firmware.

See Firmware and PinOut for more details

Step 6: Close it up

Carefully screw-on the cover and enjoy your new and caffeinated lamp.

PinOut

UART

Note	The diagram on the PCB v0.1 shows IO8 - it is connected to IO9!

To upload software you can use the standard workflow using esptool.py ^[2] just like any other ESP32 board. The UART interface is exposed on the TagConnect port:

It is recommended to use this programmer from @Jana-Marie

USB

In addition, the USB interface is exposed as well. It is located on the edge next to the 24V input. Please remember that the ESP32 uses 3.3V and not the usual 5V.

Boot Mode

The front button as well as the UART interface is connected to IO9, which is the boot mode selector (on older models IO0) on this ESP32^[1]. Pressing the button or connecting it to ground puts the ESP into Download Boot mode. Now you can install firmware via UART or USB

Power & LED

Note	On v0.1 the LEDs and Power connections are not labeled on the silkscreen.

Connect the AFTONSPARVs LEDs to the left ports as shown and the power input to the right most big connections, connecting to the USB Port will destroy the ESP.

Firmware

WLED

Installation

Installing the WLED firmware is easies with their web installer: install.wled.me
When installing with esptool ^[2] follow this guide and use the ESP32-C3 binary: kno.wled.ge/basics/install-binary
Important: Install this ESP32-C3 bootloader not the ESP32 bootlader.

Configuration

LED Preferences > Hardware setup
1: PWM RGB
Index: 0
GPIOs: 4, 5, 6

Button 0 GPIO: 9, Pushbutton

Show screenshot

Hardware

Important

It is not possible to hand-solder this project, it requires a hot-air station or reflow oven. It is recommended to use a stencil for solder paste.

BOM

Reference	Value	Qty	LCSC
C1, C4, C7, C11	100nF	4	C14663
C2	100µF 35V	1	C2831717
C3, C6, C9, C10	4.7uF	4	C560882
C5	22pF	1	C105620
L1	10uH	1	C38117
Q1-Q3	AO3400A	3	C347475
R1-R3, R7-R10, R14	10kΩ	8	C98220
R4-R6	20Ω	3	C22950
R11	1Ω	1	C22936
R12	100kΩ	1	C25803
R13	22.1kΩ	1	C25961
SW1	SW_Push	1	C2910748
U1	ESP32-C3-MINI-1-[H/N]4	1	C2934569 / C2838502
U2	SY8201ABC	1	C108052

BOM Tool

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1. https://www.espressif.com/sites/default/files/documentation/esp32-c3-mini-1_datasheet_en.pdf#table.4

2. https://docs.espressif.com/projects/esptool/en/latest/esp32/