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Analog Computer Program Control Bell DIY Kit 48Bit Adjustable Electronic Alarm Clock DIY Module

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1>. This circuit has 48 channels, and it can set alarm time independently and analog computer controlled bell. If remove the buzzer and add a relay, it can control the bell ring, which functions like computer controlled bell system.

2>. The circuit adopts high-quality glass fiber board, large pad and thick wire. It has a perfect component layout.

3>. The crystal oscillator adopts 49U 3579KHz; the digital display screen adopts long pin clock screen, use most SMD components; MCU adopts STC11F02 which is compatible with AT89C2051, and it has been programmed.

4>. The circuit adopts 3 button switches:

S1 is for adjusting status (press S1, the status display will add by 1; after larger than 98, it will automatically cycle. There are 99 status for setting; status 0 is normal, status 1 is adjusting minute, status 2 is adjusting hour, status 3-98 is adjusting alarm time; odd number is for adjusting alarm minute, even number is for adjusting alarm hour, when minute and hour are both 0, current channel alarm is invalid);

S2 is for adjusting corresponding status content, for example: if press S2 in status 5, it means adjust the second channel alarm minute; every time you press it, the number will increase 1.

S3 is reset key, if you press it, all the settings will be clear and the system will display 00:00.

5>. Status 01-98 is for adjusting status, then the left number displays status value and right number displays debugging value; in adjusting process, the colon will be always on and not flash; when the status enters into 98, press S1 will enter into status 0; when the system functions normally, the colon will flash once per second; when it goes to set alarm time, the buzzer will beep once per second; after ringing for 30s, it will stop.

6>. Second debugging, please check the time to adjust the minute and hour (status 01); every time you press the minute, the second will be clear automatically; therefore, when press minute for the last time, please press it according to the standard time, then they are synchronous.

7>. Notice: there is mini power socket. Since the PCB board is relatively thick, you need to force the pin out then solder; and it can be also null; J1 and USB both can connect power, just choose one of them to connect will be ok.

Component Listing:

NO. Components PCB Marker Parameter QTY
1 SMD 0805 Capacitor C1,C2 30pf 2
2 Electrolytic Capacitor C3 10uF/10-50V 1
3 Electrolytic Capacitor C4 220uF/10V 1
4 Ceramic Capacitor C5 0.1uf 1
5 4Bit Digital Tube DS   1
6 STC11F02 IC1 DIP-20 1
7 Passive buzzer LS1 12mm 1
8 S8550 Q1-Q5 TO-92 5
9 SMD 0805 Resistor R1-R5,R15-R17 10K 8
10 SMD 0805 Resistor R7-R14 200ohm 8
11 Button S1-S3 6*6*5mm 3
12 MINI USB Socket USB   1
13 Crystal Y 3579KHz 1
14 IC Socket IC1 DIP-20 1
15 PCB   50*53mm 1


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Analog Computer Program Control Bell DIY Kit 48Bit Adjustable Electronic Alarm Clock DIY Module