Posted on 02 Dec 2008
This project uses an Atmel at90s2313 AVR processor to measure resistance values and generate R/C style pulses suitable for driving servos or testing R/C controlled robots without the transmitter. It measures four channels and provides four R/C style pulses. It uses an LCD display to indicate the current pulse width and to indicate when the board is in CALIBRATE mode. Analog joysticks, by their nature, are highly variable so the tether unit needs to be calibrated for the particular joystick. Once calibrated it appears to be quite stable: pulse width values stay within a few microseconds over several days of operation at room temperatures.[more]
Posted on 15 Aug 2008
The display is controlled by an Atmel AVR-family microcontroller, AT90S2313.The display has seven rows containing 50 LEDs each. The display controller consists of seven transistors and seven 8-bit shift registers which all are controlled by the MCU (AT90S2313). Each transistor drives one row selecting whether it’s enabled or not. The shift registers are chained together, so their serial input is converted to parallel output of 56 bits, 50 of which is used to drive the columns. The last six bits remain unused.[more]
Posted on 08 Aug 2008
It uses only 4 chips - 3 HC TTL’s and an Atmel At90S2313 microcontroller. It has a 5 digit LED display plus one used as a band indicator.the current consumption is less than 50 mA.It counts up to at least 52 MHz.The schematic is quite straightforward. There are two major parts, the display multiplexing and the counter stage.[more]
Posted on 29 Jul 2008
Here is some experimental hardware and software to transmit and receive AX.25 packets.
It is essentially a PIC-E clone designed around a Atmel AT90S2313 with a few extra bells and whistles.[more]
Posted on 07 May 2008
This is a digital thermometer with thermostat based on a DS1621 I2C thermometer with thermostat sensor control with an AT90S2313 or Attiny2313.You can replace the sensore DS1621 with DS1631.The temperature range is 0-125C. The thermostat range is 10-40C and you can set it with up or down buttons.With on/off switch you can turn on and off the load control. When is set to off the device acts as simple thermometer.[more]