Category: make

Custom Bed Frame – Part 8

In Part 8 I stain and apply polyurethane to the frame, make the under bed drawers and add the automatic LED night lights.

I used an ATtiny85 microcontroller with an LDR (Light Dependent Resistor) so I could have the nightlight turn on/off automatically based on light level. The LEDs run on 12v and require 1.8 amps of current (in my case given the length of strip/number of LEDs I used). A MOSFET was used to allow the ATtiny85 to turn the LEDs on/off and also allow it to control the brightness using PWM (Pulse Width Modulation).

Code and schematics (and rough Sketchup drawings of the frame) for the LED controller are available on GitHub.

Acurite 3N1TXCA1 Weather Station Teardown

Teardown of a decommissioned Acurite 3N1TXCA1 weather station. What kind of sensors and build quality do these inexpensive weather stations have?

The only two components of note are the outdoor temperature/humidity sensor and the pressure sensor (for barometric pressure readings). The most surprising thing is the piss-poor build quality of the unit.

SHT21 datasheet

DMP015A-1 datasheet

Similar (currently available) weather station