Compact 4-digit DIY Digital LED Clock Kit Light Control Temperature Date Time Display with Transparent Case

I purchased this to re-live the days of my youth when I used to buy and build other electronic kits. I was able to easily follow the instructions and the unit functions perfectly. I keep this running under my computer monitor during work to inform me the time, date and temperature. I admit that it is a bit cumbersome to re-program if it loses the time, as it is not very intuitive, but I did discover the correct battery to use so that small power losses are absorbed and the correct time re-displays when the power stabilizes again. I love the clear case, so you can admire the detail of your work.

Good quality product. Very quick delivery

After a long search for a simple LED watch with such numbers, I decided in favor of this kit, although I was totally inexperienced in soldering and electrical engineering ("It will work somehow ..."). And I have to say that it worked quickly and well, even if some of the soldering looked gnarled. After assembly, the watch did what it was supposed to do: time, temperature, alarms and date. Okay, the display takes some getting used to, that after 45 seconds the other information is displayed for 5 seconds at a time, but I only need the watch at night to know what time it is and to be woken up in the morning. So it fits. Only, as Werner Mayer wrote on February 4th, 2018, the kit seems to have a small circuit board error: After assembly and adjustment (still full of enthusiasm), my kit showed no errors in the late evening hours, then the following day around 5:00 p.m. Clock (back from work) an error ("Waaa ... ??"): The LEDs of all four digits in position "b" (see wiring diagram, numbers 1, 2 and 4 top right, number 3 bottom left) do not have more illuminated. After writing the commentary to Werner Mayer in the evening after 10:00 p.m. they did it again, without complaining. The same failure after 7:00 this morning, no LEDs on "b". Apparently there is also a time error (connection hourly beep?). But I will now put the "bridge" according to Werner Mayer's information between resistor R2 (responsible for LED "b", at the outlet on the left) and the foot for LED "b" (position 6) on the nearest number block 4. I wonder if it will work ...

The compact 4-digit temperature-controlled date and time display and clear acrylic housing of this DIY digital LED watch kit gave me the pleasure to assemble, but the post-assembly work was impressive considering the Odds for the $ 8 Acrylic Shell Watch. The main reason I chose this watch is to be able to use the discreet "DS1302" to operate in low power standby mode. This chip is a DS flow charge timing chip, which will greatly extend the backup battery runtime in low power operation because at 300nA, less than 300nA is used. 2.0V, and the watch has a CR1220 3v battery slot, which means that once you set the time to install the battery, you need to keep all settings, and the real-time watch counts seconds, minutes, hours, date of month, month, day of the week and long service life Up to two years or batteries installed, and no additional power is required to maintain real-time status. The watch itself can work normally. Keeps time at approximately +/- 2 seconds per day. The programming on the main clock chip can use some minor modifications so that the change in temperature, day of the week, date, etc. can be disabled. And it only shows the time. There are only two buttons to program the clock. Although it is not very intuitive, it is easy to find out how to program it. You can disable hourly reminders, alarms, etc. because the ON / OFF indicator is a dot. The only problem I have is the photoresistor (LDR), which seems to be too sensitive to light, even if you use your own LED light it will turn on the maximum brightness of the LED! The easy problem to solve is to solve the problem of black paint to reduce pain in the lower part of LDR. I also made a few small changes to the circuit, and added a micro 180mAh 3.7v lithium battery to power the watch without connecting the USB port, and it looks like it can show about 6 without connecting the USB power supply. Hours of time, so the portable DIY watch is worth it. To check prices, this is an interesting weekend project. Please rate the product four stars!

Fun to assemble and great watch for the camper. I connected it to a cigarette lighter USB adapter. I attached an additional battery compartment with 2 AA batteries, now the time lasts for months when the 12 V on-board voltage is switched off.