Simple Tachometer

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STD Simple Tachometer

License: MIT

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Update time： 2020-12-22 05:56:22

Creation time： 2020-07-16 17:31:07

Description

# Tachometer Simple tachometer, based on arduino nano. 7 digit display based on ULN2003 and 74HC595 3 buttons: 1. Reset 2. Mode switch. Between Hz and RPM. 3. Point position. Chose how many digits after point will be displayed. This tachometer uses ATmega328p Input capture register of Timer Counter #1. Also I used a lot of float math in this code. ToDo is to move all math into static point to improve speed. All code you can find here: https://github.com/Ogurezzz/Tachometer

Design Drawing

schematic diagram

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Schematic
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PCB

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BOM

BOM download Purchase Parts

ID	Name	Designator	Footprint	Quantity
1	RESET	KEY1	KEY-SMD_4P-L6.0-W6.0-P3.90-LS10.0	1
2	MODE	KEY2	KEY-SMD_4P-L6.0-W6.0-P3.90-LS10.0	1
3	POINT	KEY3	KEY-SMD_4P-L6.0-W6.0-P3.90-LS10.0	1
4	Signal	LED3	LED-TH_BD5.0_RED	1
5	74HC595N_DIGIT	U2,U3	DIP-16_L19.8-W6.5-P2.54-LS7.6-BL	2
6	74HC595N_Segment	U3	DIP-16_L19.8-W6.5-P2.54-LS7.6-BL	1
7	ULM2003A	U1	DIP-16_L19.8-W6.5-P2.54-LS7.6-BL	1
8	SLR0284DRC1BD	LED1	LED-SEG-TH_SLR0284DRC1BD	1
9	SLR0283CRC1BD-6.3	LED2	LED-SEG-TH_SLR0283CRC1BD-6.3	1
10	+ - S	J2	HDR-M-2.54_1X3	1
11	680R	R1	R1206	1
12	10k	R2,R3	R1206	2
13	1k	R4,R5,R6,R7,R8,R9,R10,R11	R_AXIAL-0.4	8
14	Arduino_Nano_Header	J1	DIP-30_L43.18-W15.24-ARDUINONANO	1
15	74HC595N_SEGMENT	U2	DIP-16_L19.8-W6.5-P2.54-LS7.6-BL	1