4 layers99 × 53.3 mm
PSLab
fossasia/pslab-hardware
PSLab Hardware Design and Schematics https://pslab.io
199 parts1.7kApache-2.0
2 layers36 × 30 mm
Ladybug
z2amiller/ladybugattiny85 + WS2812 replacement for CloudB ladybug nightlight
- Size
- 36 × 30 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 11
- Nets
- 10
- Pads
- 31
- Tracks, vias
- 55, 9
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 4
- Created
- 17 Oct 2015
- Updated
- 19 May 2016
Overview
Ladybug is an open-source printed circuit board by z2amiller, from the z2amiller/ladybug repository on GitHub, published under the MIT licence. It is a 2-layer board of 36 × 30 mm with 11 parts on 10 nets, routed with 55 tracks and 9 vias.
It is built around the WS2812B. Its parts include 3 capacitors, 2 resistors, 2 ICs and 2 connectors. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
1README
README.mdladybug
attiny85 + WS2812 replacement for CloudB ladybug nightlight.
Installation
Album showing disassembly here.
The ladybug has six screws that hold the shell on. They're under the fabric. I had to cut a small slit in the fabric to access some of them, others I was able to get at through the hole for the battery pack.
Programming
The ladybug can be programmed in-system with an 8 pin SOIC clip like this. I have used a small programming shield plus an Arduino UNO as the programmer. You could also make a custom cable to hook onto a dedicated programmer like the USBASP programmer.
Future work
It turns out that the WS2812b LEDs (aka Neopixels) have quite a high quiescent current - around 800uA. This ends up eating batteries moderately quickly.
One idea would be to connect the wakeup button to a soft latching circuit and use the output of the toggle control the enable pin of a power regulator end connect the current WAKE pin on the attiny85 as a second momentary input to turn it off after 30 minutes.
For example, that circuit controlling the enable pin of a 5V boost regulator would make the following improvements:
- Vastly reduced quiescent current, probably under 20ua. Only the latch would be consuming measureable power.
- Simplified programming, less need for fancy interrupt and sleep routines - at the end of the cycle, the attiny85 would just poke the toggle and turn the power off.
- Better performance with low batteries. Right now, as the batteries decay, the ladybug gets wonky. The blue LED has a higher forward voltage, so as the batteries start to run down, the blue LED inside the WS2818b will no longer light up, though the green and red channels continue to work.
- Probably a little bit brighter running at full 5v instead of the 4.5v or less coming from 3xAAA batteries.
There is plenty of room on the board for a boost regulator and toggle circuit.
Parts
11| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 100nf | Capacitors_SMD:C_0603_HandSoldering | C2, C3 |
| 1 | 100 | Resistors_SMD:R_0603_HandSoldering | R1 |
| 1 | 10uF | Capacitors_SMD:C_0805_HandSoldering | C1 |
| 1 | 470K | Resistors_SMD:R_0603_HandSoldering | R2 |
| 1 | ATTINY85-S | w_smd_dil:so-8 | IC1 |
| 1 | CONN_2 | Pin_Headers:Pin_Header_Straight_1x02 | P2 |
| 1 | CONN_5 | Pin_Headers:Pin_Header_Straight_1x05 | P1 |
| 1 | WS2812B | z2a_leds:WS2812b | U1 |
The 9 most common of 11 parts.
Questions
How big is the Ladybug PCB?
It measures 36 × 30 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Ladybug use?
11 parts, built around the WS2812B. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Ladybug KiCad files?
From the z2amiller/ladybug repository on GitHub, at the commit this page was made from: the board is hardware/kicad/LadyBug.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Ladybug design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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