gres
Full Member level 4
Tool has a lot a usefull functions like: temperature ( at house and outside), clock with two channel time driver, simple thermostat with hysteresis and alarm system with two protection circuits. Quiet alert function allow to check hour that alarm was start, without horn stop. Steering system is built on ATMEG16 microcontroller, all setup is you can make by very simple interface with LCD display and 6 bottoms keyboard. Responsible for time checking is RTC system thanks to that tool can work for long time with battery. System outputs based on triacs consist optioizolating from line voltage.
Diagram
Heart of device is U1 microcontroller (ATMega16) with quartz resonator X1 (16MHz) and condensers C1 (22pF) and C2 (22pF). Time checking is via RTC U2 (PCF8583 ) system. For proper work we need quartz resonator ( so called - clock) X2 (32,768 kHz) and condenser C5 (33pF). Condensers C6 (100nF) and C7 (47 uF) filtering voltage of RTC power, that comes from simple uninterruptible power system with diodes: D1 (1N4148) D2 ( 1N4148) and battery BAT1 (3V). Resistors R15 (3,3k) and R16 (3,3k) bend line of I2C bus to power +.
Power circuits of all board are build on U5 stabilizer (7805) and filtering condensers C3 (22uF) C4 (47uF) and C8 (100nF). Potentiometer P1 (10k) allow to adjust display contrast W1 (LCD 16x2). T1 transistor (BC556) and R2 resistor (3,3k) controll display backlight
Prog (Goldpin) connector allow to program microcontroller U1.
Tool keyboard are buttons S1-S6 (uSwitch). ALARM (ARK) is input for alert sensors.
More information at https://www.elektroda.pl/rtvforum/topic1498726.html
Diagram
Heart of device is U1 microcontroller (ATMega16) with quartz resonator X1 (16MHz) and condensers C1 (22pF) and C2 (22pF). Time checking is via RTC U2 (PCF8583 ) system. For proper work we need quartz resonator ( so called - clock) X2 (32,768 kHz) and condenser C5 (33pF). Condensers C6 (100nF) and C7 (47 uF) filtering voltage of RTC power, that comes from simple uninterruptible power system with diodes: D1 (1N4148) D2 ( 1N4148) and battery BAT1 (3V). Resistors R15 (3,3k) and R16 (3,3k) bend line of I2C bus to power +.
Power circuits of all board are build on U5 stabilizer (7805) and filtering condensers C3 (22uF) C4 (47uF) and C8 (100nF). Potentiometer P1 (10k) allow to adjust display contrast W1 (LCD 16x2). T1 transistor (BC556) and R2 resistor (3,3k) controll display backlight
Prog (Goldpin) connector allow to program microcontroller U1.
Tool keyboard are buttons S1-S6 (uSwitch). ALARM (ARK) is input for alert sensors.
More information at https://www.elektroda.pl/rtvforum/topic1498726.html