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ESP32 Doorbell via Telegram

“The UPS Man Always Rings Once”

Based on a Labs project | October 2019 | Find it here
ESP32 Doorbell via Telegram
It happens to all of us — you’re at home and there’s a caller at the door but for some reason or other you do not hear the doorbell buzz or ring! No problem if the person at the door has your phone number handy as he or she will be able to get hold of you. In all other cases, Catch-22 governs, which is especially annoying when you stayed home desperately waiting for a parcel delivery within a certain time frame. Here now comes a DIY project to end such inconvenience.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.

Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Download the BOM list
The BOM (Bill of Materials) is the technically exhaustive listing of parts and other hardware items used to produce the working and tested prototype of any Elektor Labs project. The BOM file contains deeper information than the Component List published for the same project in Elektor Magazine. If required the BOM gets updated directly by our lab engineers. As a reader, you can download the list here.
Want to learn more about our BOM list? Read the BOM list article for extra information.
Component list

Component List

R1 = 2.2kΩ 5%, 0.25W, 250V
R2,R3 = 10kΩ 5%, 0.25W, 250V
D1 = 1N4148
T1 = BC337
IC1 = FOD814A, AC optocoupler w. transistor output, 1-channel, DIP, 4-pin, 50mA, 5kV
BT1 = optional battery w. holder
RE1 = G5V-2-H1 5DC, 5VDC coil, DPDT, 1A (Omron) 
K1,K3 = 2-way PCB screw terminal block, 0.2’’ pitch (5.08mm), 630V
K2 = 30-pin (2x15) pinheader, snap-off, vertical
M5Stack ESP32 Basic Core, from Elektor Store (or equivalent ESP32 module)
PCB no. 191145-1 V1.0, from Elektor Store

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