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Huzzah IOT Combo Board

9 months ago 155
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This board is a first cut at using the ESP32 dev board from Adafruit to provide for an IOT connection hub. It will read 8 sensors connected through 2 4 channel optoisolator boards purchased separately. It will control 4 relays using a Sainsmart 4 channel active low relay board. The ESP32 code will connect through IFTTT or another MQTP service to talk to Amazon's Alexa unit and allow voice commands to be processed. It uses an ILI9341 compatible 240x320 TFT display for messaging and console services.

I had to edit the library version of the ESP32 component. PCB had wrong net layout. The designer had misnumbered the lower numbered pins on the left side. Pin 1 is upper left not lower right.


Huzzah IOT Combo Board schem

Huzzah IOT Combo Board v1

Huzzah IOT Combo Board v1.2

Huzzah IOT Combo Board v1.3

Huzzah IOT Combo Board v2.0

Huzzah IOT Combo Board v2.1


ID Name Designator Footprint Quantity
1 M08LOCK JP1 1X08_LOCK 1
2 LD1117AV33 U5 TO-220(TO-220-3) 1
3 10k R3,R4 AXIAL-0.4 2
4 220 R1,R2 AXIAL-0.4 2
5 M05LOCK JP3,JP4 1X05_LOCK 2
6 JST-XH-02 U14,U6 JST-XH 2 JD 2
7 5v Pwr LED1 IRL80A 1
8 1N5818G D1,D2,D3 DO-15_BD3.1-L6.7-P10.70-D0.9-RD 3
10 0.47u C4 RAD-0.2 1
11 0.1u C5,C8,C12 RAD-0.2 3
12 10u C6,C7,C13 RAD-0.2 3
13 1u C11 RAD-0.2 1
14 10uf C14 RAD-0.2 1
15 1uf C10 RAD-0.2 1
16 SN74HC151N Horner U13 DIP16 1
17 Terminal KH 5.08-2P U1,U2,U3,U4,U7,U8,U9,U10,U11,U12,U15,U16,U18 KH_PKG_P5.08_KF128L-5.08-2P 13
18 220uf C1 CAP-TH_BD6.3-P2.50-D1.0-FD 1
19 100uF C2,C3 CAP-TH_BD6.3-P2.50-D1.0-FD 2
20 220uF C9 CAP-TH_BD6.3-P2.50-D1.0-FD 1
21 PCB switch 9mm S1,S2 PCB SWITCH 9MM 2
22 M10LOCK JP2 1X10_LOCK 1
23 SN74HC138N- Horner U17 DIP-16_L19.7-W6.6-P2.54-LS10.9-BL 1
24 B3F-10XX S3 B3F-10XX 1




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