LoRa optical water meter sensor

Completed

STD LoRa optical water meter sensor

License: GPL 3.0

Mode:

Editors' pick

Update time： 2024-04-01 18:29:29

Creation time： 2024-02-23 17:28:50

Description

A module to count the rotations of the little metallic disc on water meter (called "cyble") and send data with a LoRa transmitter.

This is the optical version, for mirror style disks that are not very inductive. LoRa module transmit measure values.

Firmware is an example of working. It must be adapted to the shape of the cyble (half disc, third disc) and to the LoRa packet to transmit.

Design explanations could be found here :

Design Drawing

schematic diagram

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PCB

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BOM

ID	Name	Designator	Footprint	Quantity
1	100nF	C2,C3,C4,C5,C11,C13	C0805	6
2	10uF	C10	CASE-A_3216	1
3	22uF	C12	C0805	1
4	CNY70	IR1,IR2,IR3	OPTO-TH_CNY70	3
5	AVR_ISP_INLINE	ISP1	AVRISP_INLINE_SMD	1
6	SERIAL	J1	HDR-M-2.54_1X4	1
7	LED	LED1	LED0805_RED	1
8	OUT_A	PAD1	MEASUREMENT_POINT_ROUND-SMD-PAD_SMALL	1
9	IN_A	PAD2	MEASUREMENT_POINT_ROUND-SMD-PAD_SMALL	1
10	COL	PAD3	MEASUREMENT_POINT_ROUND-SMD-PAD_SMALL	1
11	MODE	PUSH	KEY-SMD_4P-L6.0-W6.0-P4.50	1
12	390	R1,R5,R6	R0805	3
13	27k	R2,R3,R7	R0805	3
14	100k	R4	R0805	1
15	1k	R13	R0805	1
16	10k	R15,R16	R0805	2
17	M2.5 Mounting Screw Hole	SCREW1	M2.5 MOUNTING HOLE	1
18	ATMEGA328P-AU	U1	TQFP-32_L7.0-W7.0-P0.80-LS9.0-BL	1
19	SX1278 - RA01	U3	WIRELM-SMD_M-SX1278S2	1
20	JST-XH-02-PIN	X1	JST-XH-02-PACKAGE-LONG-PAD	1