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STD Home Automation

License: GPL 3.0

Mode: Editors' pick

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Update time: 2024-06-19 11:49:21
Creation time: 2024-06-15 16:49:01
Description
## Overview ![](//image.easyeda.com/pullimage/MSYxLtS7Vejg8A2UetMCAOHPqObNoNz2vqq59RPB.png) A budget friendly approach to replace regular switchboard with smart switchboards. Featuring 1. Six regular switches 2. Two **dimmable** switches, which can be use to regulate AC devices (eg. Ceiling Fan, Tangsten Lamps) 3. One Temperature and Humidity sensor  4. One LDR 5. One Gas Detector (MQ2) 6. One Master Switch to turn of connection to save power / during emergency situations. 7. One fuse All, keeping the pcb easy to assemble by using all through hole pins. This device is a operated though a **ESP32 Devkit C** module, chosen for its wide sprectrum IoT capabilities. ## Intented Usage This module is intended to be operated via customised smartphone-application, with modules installed in all rooms, all connected to the same WLAN network. However the buttons on the Board are for convience and for peace of mind. The Onboard Switches should have higher priority than smart phone. Press and Hold delays should be the key for switching states/modes/levels. The Wifi LED, should be used to dictate other statuses aslo, specifically it can show different blink rates during dimming level selection. The Right Side of the front panel is meant to be easily accessible, as the emergency switch lies there and the cover for the right side must be a mesh (for proper input of the gas sensor). The LDR must be on the surface of the cover. The IR sensors should be covered from all sides except the front glass. The status leds should illuminate the covers printed symbol. The PCB is divided in two upper and lower parts to isolate AC and DC portions and to keep the PCB simple. Copper grounds were not used as loadline AC was used in the PCB. ## ## Limitations 1. Designed to be used with 6A max current flow 2. When Touching the upper portion of the front panel, the bottom ones can also get activated, this should be mitigated by software (eg. If upper half input detected , reject lower ones) 3. As a decoder was used to select the IR Sensors, The uc cannot read all/bulk IR readings at once, however, it won't be a problem, as ESP32's clock speed is high enough. 4. Disconnecting the ESP 32 is tricky as its below the MQ-2 Sensor. 5. DHT11 was used to lower the budget and in Bangladesh temperature stays withing 0-40 degree celcius. ## 3D Models ### Front Panel Front | Back :-------------------------:|:-------------------------: ![](//image.easyeda.com/pullimage/kW4c8AMNyVw9kEfJiC49RSzWQzgifjivlaAd7jmd.png) | ![](//image.easyeda.com/pullimage/lMWIwRlvy3pRtvCS8NfhWQOK4c9b5oUflglrXRbv.png) ### Inner Panel Front | Back :-------------------------:|:-------------------------: ![Inner Panel [Front].png](//image.easyeda.com/pullimage/2ZURhEtwcsDIZImBgANPWG5HeqKg0NKAER5ghhT2.png) | ![Inner panel [Back].png](//image.easyeda.com/pullimage/n5ihw0ZmmgSLNqAddroJ8NLlagnBd70lDQ2d10PQ.png)
Design Drawing
schematic diagram
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PCB
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ID Name Designator Footprint Quantity link
1 2Pin Connector AC,ACO,ACI,ACO0,ACO1,ACO2,ACO3,ACO4,ACO5,ACO6,ACO7 CONN-TH_XY308-2.54-2P 11 XY308-2.54-2P
2 TCRT5000L CGQ0,CGQ1,CGQ2,CGQ3,CGQ4,CGQ5,CGQ6,CGQ7 OPTO-TH_TCRT5000L 8 TCRT5000L
3 1k DHT_RES,RDIM1_GATE,RDIM2_GATE,R_RL0,R_RL1,R_RL2,R_RL3,R_RL4,R_RL5,R_RL6,R_RL7 R_AXIAL-0.5 11 R_AXIAL-0.5_EU
4 74HC238N D_IR1 PDIP-16_L19.3-W6.5-P2.54-LS7.6-BL 1 74HC238N
5 FUSE5X20 FUSE1 FUSE-TH_L24.4-W9.4-P22.60 1 FUSE5X20
6 LAYOUT SENZOR GAZ MQ-2_HORIZONTAL GAS SENZOR GAZ MQ-2_HORIZONTAL 1 LAYOUT SENZOR GAZ MQ-2_HORIZONTAL
7 Headers  Pins1x15P 2.54mm H_FIRSTBOARD HDR-TH_15P-P2.54-V-M 1 Headers  Pins1x15P 2.54mm
8 10k IR_OUT_0,IR_OUT_1,IR_OUT_2,IR_OUT_3,IR_OUT_4,IR_OUT_5,IR_OUT_6,IR_OUT_7,ZERO_RES1,ZERO_RES4 R_AXIAL-0.5 10 R_AXIAL-0.5_EU
9 PHOTOCELL LDR PHOTOCELL-KIT 1 PHOTOCELL
10 100k LDR_RES R_AXIAL-0.5 1 R_AXIAL-0.5_EU
11 LED_th LED0,LED1,LED2,LED3,LED4,LED5,LED6,LED7,LED_PWR LED-TH_BD5.0_RED 9 LED-TH-5mm_R
12 220 LED_COMM_R,R_LED_STATUS R_AXIAL-0.5 2 R_AXIAL-0.5_EU
13 LED_WIFI LED_WIFI LED-TH_BD5.0_RED 1 LED-TH-5mm_R
14 200 R_IR0,R_IR1,R_IR2,R_IR3,R_IR4,R_IR5,R_IR6,R_IR7 R_AXIAL-0.5 8 R_AXIAL-0.5_EU
15 Rocker switch601-10211BB SW1 SW-TH_601-10211BB 1 Rocker switch601-10211BB
16 DHT11 TEMP SENSOR-TH_DHT11 1 DHT11
17 ESP32-DEVKITC-32D U2 COMM-SMD_ESP32-DEVKITC-32D 1 ESP32-DEVKITC-32D
18 HLK-10M05 5V PWRM-TH_HLK-10M05 1 HLK-10M05
19 1N4007 D0,D1,D2,D3,D4,D5,D6,D7 DO-41_BD2.4-L4.7-P8.70-D0.9-RD 8 1N4007
20 DF04M FBR1 DFM_4P-L8.4-W6.4-P5.10-S7.62-BL 1 DF04M
21 Female header1X15P 2.54mm F_HEADER HDR-TH_15P-P2.54-V-F 1 Female header1X15P 2.54mm
22 KMOC3021 KMOC3021_1,KMOC3021_2 DIP-6_5P-L7.3-W6.5-P2.54-LS7.6-BL-PE5 2 KMOC3021
23 MCT2EM MCT2EM DIP-6_L8.5-W6.4-P2.54-LS7.6-BL 1 MCT2EM
24 BTA16 Q1,Q2 TO-220F-3_L10.2-W4.9-P2.54-L 2 BTA16
25 BC547C QRL0,QRL1,QRL2,QRL3,QRL4,QRL5,QRL6,QRL7 TO-92-3_L4.9-W3.7-P1.27-L 8 BC547C
26 200k RDIM1_INP,RDIM2_INP R_AXIAL-0.5 2 R_AXIAL-0.5_EU
27 SRD-05VDC-SL-C RLY0,RLY1,RLY2,RLY3,RLY4,RLY5,RLY6,RLY7 RELAY-TH_SRD-XXVDC-XL-C 8 SRD-05VDC-SL-C No
28 47k ZERO_RES2,ZERO_RES3 R_AXIAL-0.5 2 R_AXIAL-0.5_EU

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