All posts in the 'Timer projects' Category
Posted on 16 Jul 2008
The ARDF controller was created after a request to be able to play random audiofiles for an ARDF transmitter, most existing designs were based on an 16F84, a somewhat aging design and better controllers are currently available. Also most controllers had a 5-10 mA current drain which can be improved, this design requires less than 400 uA.. To allow a very small controller footprint and flexible configuration the timer is not configured with (dip) switches but via a serial connection and a host PC. The memory option is optional and is only required for a wave file playback, all other options (CW, Single Tone, Tone Sequences and Audio Effects) do not require the I2C memory chip.[more]
Posted on 17 Jun 2008
In counter mode it provides 1Hz resolution up to 100Mhz. In timer mode maximum resolution is 0.0000001 Hz up to 1Hz. Resolution is reduced by one digit for each additional decade. Multiple frequency updates per second by employing a sliding window for calculation.[more]
Posted on 11 May 2008
The purpose of this project is to present a device that is useful and at the
same time demonstrate to the beginner many features involved in programming
the PIC. Some of the topics included are:
ย� * Simple use of MPASM assembler
ย� * Demonstration of use of timer 0 and the prescaler
ย� * Use of length of instructions to set up timing delays
ย� * Using interrupt routines
ย� * Detection of switch closures including debouncing
ย� * Saving and recovering data from the onboard EEPROM
[more]
Posted on 20 Feb 2008
Imagine you are on a shooting range and you want to improve yourshooting skills on a moving target, but the target canโt move. What doyou do? You could for example count the seconds and imagine that the target moves, but this is not a particularly good and accurate solution.The shooting timer provides an audible visualization of a moving target that helps you concentrate and focus on the shooting and not on timekeeping.The shooting timer is a rather simple construction preprogrammed with three types of shooting categories; 25 meter standard pistol, 25 meter fine pistol and terrain pistol. Each category consists of up to three disciplines.This project uses PIC12F675 and internal RC oscillator which is calibrated to be accurate.[more]
Posted on 13 Feb 2008
This is a simply and easy build 4-channel timer, suitable for energy saving, simple hardware and nice firmware with c coding. Automatic power down mode, simple settings, optional buzzer for sound alarm.This project use ATMEL AT89C4051 and MAX7219 as the main parts.[more]
