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How to Read Many Switches with One MCU Pin

Have you ever been chugging away at a project(s) and the project keeps growing and growing, while you add more things to it (we call that a Feaping Creaturism)? On a recent project, I was building a frequency meter and added a five function signal generator/frequency synthesizer. I soon wound up with more switches than I had available pins left, so what's a guy to do? However, I soon had seven more switches ...

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Cellphone Operated Robot Using Microcontrollers

Component Required: IC1 - MT8870 DTMF decoder IC2 - ATmega16 AVR microcontroller IC3 - L293D motor driver IC4 - 74LS04 NOT gate D1 - 1N4007 rectifier diode R1, R2 - 100-kilo-ohm R3 - 330-kilo-ohm R4-R8 - 10-kilo-ohm C1 - 0.47μF ceramic disk C2, C3, C5, C6 - 22pF ceramic disk C4 - 0.1μF ceramic disk XTAL1 - 3.57MHz crystal XTAL2 - 12MHz crystal S1 - Push-to-on switch M1, M2 - 6V, 50-rpm geared DC motor Batt. ...

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Stepper motor Driver Using AT2313 microcontroller

Description With this circuit you can drive a unipolar stepper motor. It operates in full step mode. You can get a stepper motor from an old 5.25 disk drive. The AVR attiny2313 micro controller controls the pulses for the stepper motor. The pulses are amplified by the ULN2003 driver. The driver accepts 5V inputs, the output for the driver is up to 30V so you can connect an stepper motor of up to 30V. With t ...

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Real Time Clock PCF8583 Using AVR microcontroller

Description The PCF8583 is a clock/calendar circuit based on a 2048-bit static CMOS RAM organized as 256 words by 8 bits. Addresses and data are transferred serially via the two-line bidirectional I2C-bus. The built-in word address register is incremented automatically after each written or read data byte. Address pin A0 is used for programming the hardware address, allowing the connection of two devices to ...

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