Interval timer on PIC16F684. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Clocks, timers, relays, load switches
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A timer circuit with separate setting of the load on and off time is proposed. A distinctive feature is the use of a SoG LCD indicator with a built-in serial interface (trt.ru/products/tic/pdf/ML1001.pdf) of the SPI type (trt.ru/products/tic/pdf/segment/TIC8213.PDF) and self-powered from a three-volt chemical source (one lithium tablet, a couple of alkaline tablets, etc.). Power supply from 2,5 to 5 volts is allowed. An independent source makes the timer non-volatile, which means that it is not necessary to set the time each time you turn it on.
The indicator contains 8 seven-segment digits. The current time indication is carried out by the central four digits with minutes and hours separated by a decimal point. In the rightmost familiarity, the current state of the control key is shown using subscript zero and one (half the height) - zero-off, one-on.
Settings are made with four buttons. Holding down the "setting" button for 2...2,5 seconds leads to the transition to the setting mode. When entering the mode, the first setting of the current time (hours) is offered. In this case, the display moves to the extreme left position. The "min" and "hours" buttons incrementally set the desired time. Holding these buttons for more than 2 seconds causes the corresponding value to auto-increment at a frequency of about 2 hertz. After setting the current time, the recording must be made by pressing the "set" button once. If you want to set the on or off timer, then pressing the "time / timer on / timer off" button selects the desired value for setting. When switching to the setting of timers, the indication moves to the far right position, and on the left, a subscript zero or one shows which timer is currently to be set. The order of setting the timers is the same as for the time. After setting EACH TIMER, it is necessary to save the value in memory by pressing the "set" button. In setting mode, the timer does not work!
The program is written in ASMe. Source code is available. The controller is powered by a built-in 8 MHz RC generator. The watch is powered by a 32768 Hz crystal oscillator. Most of the time the controller is in the slip. The average consumption is about 5...7 uA. In setting mode, the consumption is about 0,7 mA.
A low-threshold MOSFET (IRLML2502, BSS138 and similar) is used as a key. Any buttons. Other elements of SMD. PLS5 programming connector with sequence as in PICKit2.
In the attached file you will find a PDF file for LUT (printed 1:1, the image is mirrored under the TOP layer).
The reverse side is solid metallization. One jumper. Solder transitions to the ground through the corresponding via holes.
Download ASM source, HEX firmware and PCB PDF
Author: Yampolsky Mark, MO, Fryazino; Publication: cxem.net
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Comments on the article:
Eugene
Please tell someone the characteristics of the timer, is it cyclic, how many ON-OFF settings can be programmed? Thank you.
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