CoinPCB

CoinPCB

Simple Coin Shaped ESP8266 Breakout Board

V0.2 Errata

• pins D3,D4,D8 are used for chip bootup to figure out where to run the program from . This causes issues if the Coin is hooked into the board on bootup.
• D3,D4 also include a pull up resistor on boot and must be rerun to allow the pins to run to low when turned on.
• simple work around is to not solder Q1
• advanced is to exacto knife the D3 trace and run a jumper wire from the D3 pin to the D2 PIN if you aren't going to use the I2C connection. If you do this come see me:)
• reprogram the chip to get it back into a normal state. You can also plug the wifi board into power, let it boot and then plug the coin into the wifi board. https://www.reddit.com/r/esp8266/comments/5ujgfl/issue_powering_up_wemos_d1_mini_with_pins_d3_d4/

V0.2 Updates

• Fixed V0.1 issues with LED running to power
• Added 53 Ohm resistor to 5V line through Infrared
• Created DHT12 I2C symbol package
• Changed component naming references to start at D9 after input referencs throug D8

V0.1 Errata

• D1 LED is setup incorrectly on foot print d1 polarization is wrong
• the infrared transmitter footprint needs to be rotated so the emitter is pointing out on the next rev
• D3 and D2 LED need to be run to ground instead of power
• use an exacto knife to cut the traces between 3.3VCC and D3 and Vcc and D4
• use an exacto knife to scrape the top layer off to make the copper ground plane visible, jumper the copper ground plane to the two 100ohm resistors
• input pin D3 is already on a 1k pull down so there is no need to add another resistor.
• you can just jumper R1 across the two pads.

Updates for Next Version

add a spot for a pwm to run a servo break out the rest of GPIO lines onto the board add a coincell holder with a power switch

To Do

Create a how-to on setting up KiCad with the newest symbol and footprint libraries as well as how to import digikey libraries.