DIY Kits AT89C2051 Electronic Clock Digital Tube LED Display Suite Electronic Module Parts and Components DC 9V - 12V

ProductDescription

This kit uses three two digit nixie tubes to display the hours, minutes and seconds of time respectively, and uses two small LEDs to replace colons for interval. The use of single-chip microcomputer programming control display, the use of timer timing, high accuracy, can be adjusted by a button time, also with memory battery, the main power off time is still going (nixie tube does not show). It is practical.

Warm reminder: it is a kit, not welded! ! ! Finished product display

Product Parameter

Power supply voltage: DC 5 -- 12V (above 7V, the middle four LED will be on)

Recommended voltage: DC 9V

Working current: 35mA (external power supply, self provided)

Standby current: 1.2 MA (powered by standby battery)

Backup battery: CR2032 (3V)

Plate size: 90mm * 65mm

Product Instructions

1. 89C2051 digital clock set, control chip adopts AT89C2051, digital tube adopts three two red common positive LED digital tubes, display clear and high brightness, because it is scanning display mode, so each digital tube ABCDEFG pin adopts bus parallel connection, change r4-r10 resistance value can change display brightness.

2. S1 button is used to calibrate the time. Press and hold for more than 2 seconds to enter the calibration time state and exit. Quick touch is used to adjust the time value.

3. A 3V backup battery is added to the circuit. When the power is cut off, the AT89C2051 uses the backup battery to supply power. The clock will not stop, but the nixie tube does not display. The backup battery for incoming calls will not work. The AT89C2051 uses the external power supply, and the nixie tube displays normally. So you can add a power switch, turn off the power when you go out, call again when you come back, and display normally, so as to save electricity.

4. The time of departure is accurate.

Pay Attention

If the display of the nixie tube is abnormal, please disconnect the power supply, remove the backup battery, and then install it again. After power on, it will return to normal. If it is used by the main power supply for a long time, please remove the R1 resistance, that is, you can not weld the R1 resistance. The existence of R1 resistance will charge the battery, and the long-time power supply will continuously charge the battery. This is a non rechargeable battery, which will damage the battery and cause the battery to work abnormally. Occasionally power on for a short time, the display time can be welded R1, and the battery can be charged occasionally to keep the power.