fhiew Solder in this order: resistors, crystal oscillator, 4-pin header, capacitors, IC sockets, battery holder, power socket, switches, buzzer, transistors, LDR, thermistor. The 4-pin header mounts near the top left of the PCB. Bend the pins upwards 20° to fit hole in the case. LDR (GM): (above the battery, height .5cm above the board) The thermistor (RM) middle on the top edge, height 9mm above the board. Check everything before adding the LED displays. Solder Digits 3 & 4 upside down. Check fit of the displays: I had to file some of the feet slightly. Attach adhesive diffuser. Insert ICs & battery Case: do the rear first. Setting: Lower button: parameter select. Top button: Show date or increase by 1. The parameters: Min; Hour; Alarm min; Alarm h; Alarm on-off (0000 or 1111); Month; Date; Day of week; Auto brightness on-off (0 _ _ 0 or 1 _ _ 1 shown); Hourly chime on-off (_ 0 0 _ or _ 1 1 _ shown)

fhiew Solder in this order: resistors, crystal oscillator, 4-pin header, capacitors, IC sockets, battery holder, power socket, switches, buzzer, transistors, LDR, thermistor. The 4-pin header mounts near the top left of the PCB. Bend the pins upwards 20° to fit hole in the case. LDR (GM): (above the battery, height .5cm above the board) The thermistor (RM) middle on the top edge, height 9mm above the board. Check everything before adding the LED displays. Solder Digits 3 & 4 upside down. Check fit of the displays: I had to file some of the feet slightly. Attach adhesive diffuser. Insert ICs & battery Case: do the rear first. Setting: Lower button: parameter select. Top button: Show date or increase by 1. The parameters: Min; Hour; Alarm min; Alarm h; Alarm on-off (0000 or 1111); Month; Date; Day of week; Auto brightness on-off (0 _ _ 0 or 1 _ _ 1 shown); Hourly chime on-off (_ 0 0 _ or _ 1 1 _ shown)

fhiew Lower button is the Select button Upper button is the + to increase the value (1.) Minute (00-59, lower dot of colon flashing) (2.) Hour (00-23, upper dot of colon flashing) (3.) Alarm minute (4.) Alarm hour (5.) Alarm on-off: 0000=off; 1111=on (6.) Month (1-12) upper dot flashing (7.) Date of month (1-31) lower dot flashing (8.) Weekday (-N- shown on screen, N=1 to 7. The second hyphen alternates with the numeral 8). (9.) Auto brightness on-off (0 _ _ 0=off; 1 _ _ 1=on, without the underscores) (10.) Hourly chime on-off (_ 0 0 _ =off; _ 1 1 _ =on without the underscores)

fhiew Solder in this order: resistors, crystal oscillator, 4-pin header, capacitors, IC sockets, battery holder, power socket, switches, buzzer, transistors, LDR, thermistor. The 4-pin header mounts near the top left of the PCB. Bend the pins upwards 20° to fit hole in the case. LDR (GM): (above the battery, height .5cm above the board) The thermistor (RM) middle on the top edge, height 9mm above the board. Check everything before adding the LED displays. Solder Digits 3 & 4 upside down. Check fit of the displays: I had to file some of the feet slightly. Attach adhesive diffuser. Insert ICs & battery Case: do the rear first. Setting: Lower button: parameter select. Top button: Show date or increase by 1. The parameters: Min; Hour; Alarm min; Alarm h; Alarm on-off (0000 or 1111); Month; Date; Day of week; Auto brightness on-off (0 _ _ 0 or 1 _ _ 1 shown); Hourly chime on-off (_ 0 0 _ or _ 1 1 _ shown)

fhiew Solder in this order: resistors, crystal oscillator, 4-pin header, capacitors, IC sockets, battery holder, power socket, switches, buzzer, transistors, LDR, thermistor. The 4-pin header mounts near the top left of the PCB. Bend the pins upwards 20° to fit hole in the case. LDR (QM): (above the battery, about .5cm above the board) The thermistor (RM) middle on the top edge. It should sit a bit less than 1cm above the board Check everything before adding the LED displays. Solder Digits 3 & 4 upside down. Check fit of the displays: I had to file some of the feet slightly. Attach adhesive diffuser. Insert ICs & battery Case: do the rear first. Setting: Lower button: parameter select Top button: Show date or +1 The parameters: Min Hour Alarm min Alarm h Alarm on-off (0000 or 1111) Month Date Day of week Auto brightness on-off (0 _ _ 0 or 1 _ _ 1 shown) Hourly chime on-off (_ 0 0 _ or _ 1 1 _ shown)

fhiew Lower button: parameter selection Upper button: +1 Note that the clock does not advance whilst in setting mode. The parameters in setting mode: Time Minutes (00-59, lower dot of colon flashing) Time Hour (00-23, upper dot of colon flashing) Alarm Minutes (00-59, lower dot of colon flashing) Alarm Hour (00-23, upper dot of colon flashing) Alarm on-off (0000 (off) or 1111 (on) is shown) Month (1-12) upper dot flashing Date of month (1-31) lower dot flashing Day of the week (-N- shown on screen, N=1 to 7. The second hyphen alternates with the numeral 8). Auto brightness on-off (0 _ _ 0 or 1 _ _ 1 shown, without the underscores) Hourly chime on-off (_ 0 0 _ or _ 1 1 _ shown, without the underscores)

fhiew It is not possible [unless you have the capability to reprogram the chip]. The chip has the temperature programmed to display about every 7 seconds.

BG231016452 You turn on auto brightness using the setting parameters. Lower button: parameter select. Top button: increase by 1. The parameters: Min; Hour; Alarm min; Alarm h; Alarm on-off (0000 or 1111); Month; Date; Day of week; Auto brightness on-off (Off: 0 _ _ 0 or On: 1 _ _ 1 shown); Hourly chime on-off (Off: _ 0 0 _ or On: _ 1 1 _ shown)

BG231016452 Parts ID and installation sequence: 220 – 220 ohm resistors (red-red-brown-gold); or you may have 200 ohm (red-black-brown-gold); or 250 ohm (red-blue-brown-gold). Any will work. 1k – 1000 ohm resistor (brown-black-red-gold). 10k – 10,000 ohm resistors (brown-black-orange-gold). Y1 – Crystal Oscillator - small silver tube. G R T V – 4-pin header. C1 and C2: capacitors, small red disc. C3: capacitor, larger yellow disc. IC Sockets, 28 pin and 8 pin. Battery holder. DC – power socket. S1 and S2 – push switches. SW1 – slide switch. Buzzer – Round plastic cylinder, 2 pins. Q1 - Q5: Transistors (black, 3 pins). GM: (Photoresistor, LDR light dependent resistor) – has zig zag line. RM: Thermistor - the glass one.

BG231016452 The designers did not add this function, but you can still do it. The reason is that when you are setting the time, the time on the clock does not advance. 1. Set the clock to one minute ahead of the current time. 2. Have the clock in normal mode (not setting mode) 2. When the seconds reach 00, watch another phone or a watch with a second hand. Time 59 seconds. 3. At 59 seconds, press the lower button ten times until you get to Hourly chime _ 0 0 _ =off; _ 1 1 _ =on. The time will freeze while you are setting the time. 4. When your phone or watch gets to 00 seconds, press the lower button to restart your clock.

BG231016452 It's a CR2020

BG231016452 The newer versions do not have a diode. You don't require one. (The glass temperature sensing thermistor looks a bit like a diode without a stripe, but it's not a diode)

BG231016452 Yes. Lower button is the Parameter Select button Upper button will increase the value Press the lower button to cycle through these parameters: 1. Minute (00-59, lower dot of colon flashing) 2. Hour (00-23, upper dot of colon flashing) 3. Alarm minute 4. Alarm hour 5. Alarm on-off (0000 (off) or 1111 (on) is shown) 6. Month (1-12) upper dot flashing 7. Date of month (1-31) lower dot flashing 8. Weekday (-N- shown on screen, N=1 to 7. The second hyphen alternates with the numeral 8). 9. Auto brightness (0 _ _ 0 (off) or 1 _ _ 1 (on) is shown, without the underscores) 10. Hourly chime (_ 0 0 _ (off) or _ 1 1 _ (on) is shown, without the underscores)

BG231016452 This is for a slide switch to power it off. The two large holes at the top and bottom are to physically anchor the switch to the board and have no other function. The three small pins are the three switch pins. If you are missing the switch, you can join the top [small] pin to the middle [small] pin instead. This is equivalent to having the switch in the "on" position all the time.

BG231016452 It duplicates the functions of power socket and the two switches, so you can power it from another source, or control it via external buttons. G is ground (power negative); V is 5V DC, and the other two (R and T) are the same as the two buttons (Connecting them to the ground is the same as pushing the button.)

BG231016452 Yes. 1. Add extra layers of dark plastic in front of display (e.g. from the inside of a mail-order plastic courier envelope, or a piece of car window tint) 2. If you haven't already done it, set Auto Brightness control to on (0 _ _ 0 = off; 1 _ _ 1 = on , shown without the underscores) 3. Replace the row of 8 resistors with 250 ohm resistors. If you have already added the LED displays, you will need to either solder the new resistors from the component side of the board, or de-solder LED displays #2 and #3 first. This may result in LED segments with slightly uneven brightness.

BG231016452 Yes, ignore the extra resistors. I have no idea what the three holes labelled in Chinese are for. Ignore them, there is no component provided for them.

fhiew Check the LED 7-segment displays are in the correct orientation: in the older versions, digit 3 should be inverted, in the newer versions, digits 3 and 4 are inverted. Check the ICs are inserted in the correct orientation. Check you have the correct external power (5V DC from any USB socket.g. a cell phone power supply), and the slide switch is on. (The 3V battery is for backup only, it does not power the unit.)