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AVR-Single-Chip-Processors AT90S, ATtiny, ATmega of ATMEL in practical examples.

Here is a list sorted by popularity, here is a list sorted by application types

The following examples are small applications to test and use these controllers practically and to demonstrate their usefulness.

All applications were tested, but I cannot guarantee their correct function.

Page link	Short description	AVR-Type	Source HTML- Format	Source ASM- Format
	Thermometers with serial interface over Infrared, measuring temperatures with an ATtiny45 and transmitting those with infrared to a IR-to-serial converter and to an RS232 interface, with extensive hard- and software still under construction	ATtiny45 ATtiny25	(see text)	(under construction)
	Infrared transmitters with variable frequencies, linear, with crystals	ATtiny25 ATtiny24	(see text)	tn25 version tn24 version
	Thermometer with the built-in thermo sensor in an ATtiny24, with 8-character LCD, adjustable with trim potentiometers or by software, selectable output in K, °C or °F, accuracy up to one tenth of a degree	ATtiny24	(See text)	thermometer_tn24_v1
8-bit-TC 16-bit-TC	Between 8 and 57 tones of the gamut plays a crystal-driven ATtiny25 with an 8-bit TC here, a 16-bit TC is here, with versatile spreadsheets in LibreOffice-calc to configure the tones and the resistors of the switch encoder	ATtiny25 ATtiny24	(See text)	(See text)
	16-stage crystal divider with an ATtiny25, divides a crystal frequency by 16 different values, as selected either by a mouse piano or by a potentiometer, with spreadsheet in LibreOffice-calc	ATtiny25	-	xtaldiv_tn25_v1
	An egg timer with 10 LEDs and a speaker, very small design with low-current LEDs and ten melodies	ATtiny24	-	eggtimer_tn24_v2
	Infrared-controlled stepper motors, two steppers controlled by one ATtiny24, IR transmitter and controller with an LCD and an ATtiny24	ATtiny24	(under construction)	(under construction)
	A scanner for power supplies with RS232 interface and/or LCD, scans a power supply with increasing currents, transmits voltages, currents, etc. via RS232 interface, two versions w/o and with LCD	ATmega48 ATmega324PA	(under construction)	(under construction)
	Crystal-controlled seconds/minutes/hours with an ATtiny25, the source code works with nearly any commercially available crystal from 32kHz to 20MHz, with spreadsheet in LibreOffice-calc	ATtiny25	second_xtal	second_xtal
	A text ticker with LEDs in four different versions, with small or large LEDs, including design software for pixels	ATtiny24 ATmega48 ATmega324PA	-	-
	Clock with 60 plus 4 LEDs, shift registers and a ATmega48	ATmega48	(in progress)	(in progress)
	Hysteresis voltages on AVR input pins, use and measurement	(Any)	(see text)	hyst INTn tn13 hyst PCINTn tn13
	Circular LED with 32 LEDs on an ATmega324PA	ATmega324PA	Circular LED Circular clock	Circular LED Circular clock
	Egg timer with ATmega8, eight duo LEDs and speaker	ATmega8	Eggtimer m8	Eggtimer m8
	Long timer with ATtiny25, duo-LED and speaker	ATtiny25	Longtimer tn25	Longtimer tn25
	Long timer with ATtiny13 and a duo-LED	ATtiny13	Longtimer tn13	Longtimer tn13
	R/2R network sine generators for DAC conversion, two practical examples	ATtiny24 ATmega324	(see diverse links in the text)
	Random numbers with the ATtiny13 - Successes and failures	ATtiny13	-	-
	Calculating random numbers with the ATtiny13, very successfull and recommendable		-	-
	Displaying random numbers on a RGB-LED with the ATtiny13, can be done and works correct		random_tn13_v1	random_tn13_v1
	Randoms from noise, nearly complete failure		-	-
	Randoms from a sine wave oscillator wit RS232 transmission to the PC mit ATtiny13, Randoms are not very nice, RS232 test and transmission program works perfect		-	random_test_tn13 random_analysis_tn13_v1
	Egg timer with 11 RGB LEDs and an ATmega8515	ATmega8515	Source	Source
	Series of diverse DCF77 receivers	-	-	-
	Cross antenna for DCF77 reception with a FET stage and AFC adjustment	-	-	-
	Direct receiver with a transistor amplifier for DCF77, with gain adjustment	-	-	-
	Direct receiver with a TCA440 and an LC filter	-	-	-
	Superhet receiver with a TCA440, LC- and 32kHz xtal filter with an LC-Oszillator or a xtal derived oscillator signal with an ATtiny25	-	-	-
	AFC/AGC/DCF decoder for DCF77 receivers	ATtiny25	-	-
	Serial receiver/decoder/display for a DCF77 watch based on those receivers with an LCD	ATtiny24	dcf77_tn24_v1	dcf77_tn24_v1
	HF/IF AM rectifier with an ATtiny25	ATtiny25	dcf77_tn25_v1	dcf77_am_tn25_v1
	PCB layouts for DCF77 receivers	-	-	-
	Interferences with DCF77 receivers	ATtiny25 ATtiny45 ATtiny85	-	tn25pwm
	A crystal oscillator to generate accurate rectangles with a selectable frequency, with several hints on using crystals as clock sources for ATtiny devices and with an ultimate calculation tool	ATtiny25	-	Tiny xtal tn25
	A 20 RGB LED BCD encoded watch with multiplexing, linear brightness control, two-key time adjustment and diverse hardware diagnostic routines	ATmega16	RGB BCD	RGB BCD
	DCF77 signal analysis, measures signal durations, with export of the data to a CSV file and import to an OpenOffice spreadsheet	ATtiny24	DCF signals	DCF signals
	Very large watch with 114 10mm LEDs, intensity control with potentiometer or foto transistor, time adjustment with two keys or with a DCF77 receiver	ATmega48	Large watch	Large watch
	Spotlight with 198 10mm LEDs, intensity regulator with potentiometer and battery monitoring	ATtiny13	Spotlight	Spotlight
	Signal generator with ATmega16, provides sawtooth, sine, triangle and rectangle signals between 2 Hz and 20 kHz, with an LCD for wave and frequency display, linear variable resistor to adjust frequency and four switches for mode selection	ATmega16	siggen_m16_v14	siggen_m16_v1 wavetab.inc LCD include
	A DCF77 synchronized clock with LCD	ATmega16	clock_m16_v5	clock_m16_v5 plus 3 inc's
	A DCF77 superhet receiver with TCA440	-	-	-
	Date and time with AVRs in assembler	(Any)	-	-
	A timer for 5 seconds to 7 minutes in 12 stages with 12 LEDs and three buttons	ATtiny24	Multitimer	Multitimer
	Stopwatches with AVRs, some theory and considerations	Any	-	-
	A four channel stopwatch with an ATmega8	ATmega8	Stopwatch_m8	Stopwatch_m8
	A three stage stopwatch with an ATtiny24	ATtiny24	Stopwatch_tn64	Stopwatch_tn64
	LCDs on an AVR, a universal include file for tailoring any LCD in any mode on an AVR, with two example applications	Any	lcd.inc	lcd.inc
		ATmega8	Example 8 bit	Example 8 bit
		ATtiny24	Example 4 bit	Example 4 bit
	Multiple keys on ADC input pins	Any	decode_key	decode_key
	Follow me - audio sensor with electret microphone	ATtiny45	Follow me	Follow me
	Servomotor controller for model railroad crossing gates	ATtiny24	Gate tn24	Gate tn24
	Stepper motor 28BYJ-24 control for modeling applications	ATtiny24	Stepper_tn24	Stepper_tn24
	Experimental board with an ATtiny and a LCD	ATtiny24 ATtiny44 ATtiny84	Include Applic lin Applic int	Include Applic lin Applic int
	Double dice with 2 displays	ATtiny24	Dice tn24 v1	Dice2 tn24 v1
	Magic circle with 13 LEDs	ATtiny2313	Magic circle	Magic circle Constants
	Binary watch with 20 LEDs	ATmega8	Watch	Watch
	A text ticker with 192 LEDs	ATmega16	Ticker	Ticker Tickertable
	Audio level meter with a 4 line LCD - Configurable in wide varieties of sensivity, linear and log, etc.	ATtiny24	-	Level meter
	Tumbling dice with two seven-segment-displays	ATmega16	-	Dice M16
	Infrared receiver and three channel switch, self-learning	ATtiny13	IR-Rx-Sw	IR-Rx-Sw
	Led light chain sequencer	ATtiny13	ledlight	ledlight
	Driving two LED lines and controlling intensity with two potentiometers	ATtiny13	ledline	ledline
	Tumbling dice, seven LEDs and a pushbutton, with PCB layout	ATtiny13	dice	dice
	Digital clock and alarm timer, 7-segment displays, Xtal control, and much more	ATmega16	digiclock	digiclock
	All about infrared remote control signals ir_measure: Measuring IR remote control signals with an ATmega8 ir_analysis: Analysing IR remote control signals ir_tx: IR remote control transmitter with an ATtiny45 ir_rx: IR remote controlled receiver with an ATtiny13	- ATmega8 - ATtiny45 ATtiny13	- ir_remote - tn45_tx ircsb	- ir_remote - tn45_tx ircsb
	8-by-8 LED matrix	ATmega16	led-grave	led-grave
	Frequency counter, nine modes, 16 MHz xtal, scheme, preamp	ATmega8	fcount_m8_v3	fcount_V03
	Eggtimer as a gift	ATtiny2313V	eggtimer_asm	eggtimer
	Stepper motor controller and driver, voltage controlled positioning	ATtiny13	steppermotor	steppermotor
	UV-LED array as exposure device with timer and LCD	ATtiny2313	UV-Timer	UV-Timer
	Signal generator with frequency and pulse-width adjustment, normal and inverted digital outputs, frequency/time/rpm/pulse-width display on LCD, controller with ADC channels, Xtal source clock, etc.	ATmega8	Main program, LCD routines, Freq table	Zipped sources
	R/2R network for DAC conversion, generating sawtooth, triangle and sine wave and playing musical notes with the 10 keys on a STK500.	AT90S8515	(see diverse links in the text)
	Akkuload - A battery loader with a microcontroller controls up to four batteries, unloads and loads, knows up to 32 battery types internally, displays the loading progress on a four-line LCD, can be operated with three keys or via a RS232 transmitter and receiver interface, with software for voltage, current and capacity charts	ATmega16	-	Akkuload zipped source code, 5 files
	SIO controlled digital clock, could be synchronized with the time normal DCF77, operated on 77.5 kHz in the VLF band in Germany, Wiring see the GIF or PDF	AT90S2313	Clock	Clock
	PCM-encoded remote control signals in a length from 0.8 to 2.2 ms are decoded using an AT90S2323 on a small test board and converted to an analogue voltage of 0 to 5 Volts	AT90S2323	PcmDec	PcmDec
	Pulse generator, generates exact signals of a desired duration and frequency, times are controlled by input from an ANSI-compatible terminal program via the SIO of the chip, e.g. on the STK200 board	AT90S8515	PwgSio	PwgSio

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