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RUSTY ESP12E-DHT21

2 layer board of 1.60x2.50 inches (40.64x63.50 mm).
Shared on March 15th, 2016 05:03.

This is a DHT 21 (11/22) [I use AM2301] sensor powered by a ESP8266 (12-E). It is meant to be run off of 2 AA batteries, hence the reason for the U1V10F3 3.3v pull-up from Pololu. It includes deep-sleep circuit and the necessary reset/flash (burn) buttons. It also includes battery level detection (though the resistor size likely needs to be adjusted.) Here is a component list: R1= 1M R2= 220k R3= 10k R4= 10k R5= 10k R6= 10k R7= 10k R8= 10k R9= 470 C1= 0.1mF

The headers for the DHT 21 (11/22) are in the upper right corner.

This is an untested REV A board

Purpose: Interior low-power temperature/humidity sensor powered by 2-AA batteries.

This is my 1st EagleCAD/PCB project

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EasyRaceLapTimer Configurable Transponder SMD R1.4

TimJC.

2 layer board of 0.47x0.72 inches (11.86x18.29 mm).
Shared on March 15th, 2016 04:02.

Changes from Rev 1.3:

Increased solder pad size for button for easier soldering
Increased solder pad size for IC1 for easier soldering
Moved button down for more clearance and easier soldering
Moved LED2 right for more clearance from IC1
Altered/added text labels

This is a new updated version of the Alexander Bierbrauer’s IR transponder for multirotor (drone) racing with EasyRaceLapTimer system. This model has a button to allow changing the transponder code at the field. This minimizes transponder conflicts, especially when racing with other groups using the same ERLT system.

This board is intended to be powered by 5V from a spare servo connector on your receiver or flight controller. The hole in the board is for cable strain relief.

Note: ATTiny85 needs to be programmed with applicable code from EasyRaceLapTimer project. This board has not been tested.

Parts to populate each board:

ATTiny85 SOP8
MMBT2222A
33Ohm 1206 Resistor
330Ohm 1206 Resistor
1206 SMD LED
100Ohm 1206 Resistor
SMD Tact Switch 3x6x2.5mm
Infrared 950nm LED LD274-3 or TSUS5202
12mm Heat Shrink
30cm male to male servo extension (cut them in half for 6 inch leads)

Optional (but recommended):

10uF 1206 Capacitor

Required for Programming:

For more informaiton visit:

EasyRaceLapTimer Base Station Raspberry Pi Hat

Old static transponders (must be reprogrammed to change transponder ID): 5V SMD R1.2 version 5V Through hole R1.1 version Battery balance port (7-8.4V) R1.2 version

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EasyRaceLapTimer Base Station Raspberry Pi Hat R1.1

TimJC.

2 layer board of 2.39x1.01 inches (60.76x25.76 mm).
Shared on March 15th, 2016 03:23.

Changes from Rev 1.0:

Increased solder pads for restart button for easier soldering
Moved C3 down slightly to allow more room for Pololu regulator
Moved buzzer down slightly
Altered/added text labels

This is hat-like board for the EasyRaceLapTimer system’s Raspberry Pi powered base station. This was designed to make cable setup easier, as well as provide an alternate means of powering the system, using a cheap regulator and hobby grade lipo/li-ion/SLA (2-3S) batteries. The board is sized for both the Raspberry Pi Model 2/3, for base station use, and Raspberry Pi Zero/A+/B+, for satellite station use (gate penalty enforcement - not tested).

Parts to complete base station: