115 lines
4.2 KiB
Markdown
115 lines
4.2 KiB
Markdown
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# AtTiny26L-8pi_counter
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Hand held device with display to count button presses. It uses buttons to detect user input one +1 and one for -1.
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Made with of the shelf components.
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For me this is a exploration in programming ASM assembly as I had never done this before.
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Also the designing was interesting.
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## Components
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### The ATTiny microcontroller
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As I had a `ATTiny26L` 8-bit microcontroller laying around I decided to use that. As it already has an onboard clock which is plenty
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fast enough for this simple project it saved me from connection a XTAL.
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```
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Ttiny26
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_____________________________________
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1 / |20
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o--|PB0 /OC1A SDA DI MOSI PA0 ADC0|--o
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2| |19
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o--|PB1 OC1A DO MISO PA1 ADC1|--o
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3| |18
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o--|PB2 /OC1B SCL SCK PA2 ADC2|--o
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4| |17
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o--|PB3 OC1B PA3 AREF|--o
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5| |16
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o--|VCC GND|--o
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6| |15
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o--|GND AVCC|--o
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7| |14
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o--|PB4 XTAL1 ADC7 PA4 ADC3|--o
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8| |13
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o--|PB5 XTAL2 ADC8 PA5 ADC4|--o
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9| |12
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o--|PB6 T0 INT0 ADC9 PA6 ADC5 AIN0|--o
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10| |11
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o--|PB7 RESET ADC10 PA7 ADC6 AIN1|--o
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|______________________________________|
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```
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### The shift register
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As the ATTiny doesn't have enough outputs do drive a 7-segment display we need a shift register. I used a `74HCT595N` as again this what I had on hand.
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```
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74HCT595N
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_____________________________________
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1 / |16
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o--|Q1 VCC|--o
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2| |15
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o--|Q2 Q0|--o
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3| |14
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o--|Q3 DS|--o
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4| |13
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o--|Q4 ~OE|--o
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5| |12
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o--|Q5 STCP|--o
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6| |11
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o--|Q6 SHCP|--o
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7| |10
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o--|Q7 ~MR|--o
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8| |9
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o--|GND Q7S|--o
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|______________________________________|
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```
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### Something to read the number
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A 7-segment display sporting 4 digits is used for outputting the number to the user. I used a `CL5642BH-30` as you guessed it already, was the one I had laying around.
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```
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CL5642BH-30
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DIG1 A F DIG2 DIG3 B
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o12 o11 o10 o9 o8 o7
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----|------|-------|-------|-------|-------|----
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----|------|-------|-------|-------|-------|----
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o1 o2 o3 o4 o5 o6
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E D : C G DIG4
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--a--
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f b
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--g--
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e c
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--d--
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1 = no path to ground
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0 = path to ground
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| b | a | f | e | d | c | g | ; |
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MSB | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | LSB
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1 | 0 | 1 | 1 | 1 | 1 | 0 | 1 | 1 |
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2 | 0 | 0 | 1 | 0 | 0 | 1 | 0 | 1 |
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3 | 0 | 0 | 1 | 1 | 0 | 0 | 0 | 1 |
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4 | 0 | 1 | 0 | 1 | 1 | 0 | 0 | 1 |
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5 | 1 | 0 | 0 | 1 | 0 | 0 | 0 | 1 |
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6 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
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7 | 0 | 0 | 1 | 1 | 1 | 0 | 1 | 1 |
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8 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
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9 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 1 |
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0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 |
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```
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### Other components
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Something to mount it all on, for this perfboard was used.
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As I use a 9v battery a 5 volt regulator was used.
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2 buttons to read the user input.
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A 3d printed case.
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Supporting electronics like condensators and current resisters as pull-up/down and current limiting.
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