Nixie Clock IN-14 All-In-One Construction Manual Download

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Arduino Nixie Clock

“IN-14 All-In-One” Clock Rev3

Construction Manual

AllInOneNixieClock14ConstructionManualRev3

Summary of Contents for IN-14 All-In-One

Page 1: ...Arduino Nixie Clock IN 14 All In One Clock Rev3 Construction Manual AllInOneNixieClock14ConstructionManualRev3 ...

Page 2: ...ch peaks of 400V Take precautions not to electrocute yourself If you are not sure what this means please do not use this clock and return it for a full refund A shock from the clock high voltage circuit is at least a nasty bite At worst it can kill you We decline any responsibility in the case of injury or death REPEAT If you are not sure please do not use the clock Powering Up When you power the ...

Page 3: ...re driving 170V Output of high voltage for driving external neons etc GND The negative side of the input supply VIN The positive side of the input supply VCC Output of regulated 5V which can be used to drive auxiliary circuitry FRONT These are the controls that go on the front panel The input button and the Light Dependent Resistor to detect ambient light GND The ground One lead of the button and ...

Page 4: ...Schematic Below is the schematic for the clock And for the LDR and button ...

Page 5: ...lator It s job is to reduce the external voltage from the power adapter down to a known and stable 5V to drive the micro controller and the K155ID1 Put the parts on the board in the marked locations in the order they appear on the list Notes See the section on Component Identification for help with identifying the components D1 should be placed so that the white stripe on the body lines up with th...

Page 6: ...rest the centre of the board This should measure 0 7V less than the input voltage If all is well proceed to the next step If not check carefully the orientation of the components and the power leads Diode D1 protects the board from having the power connected inverted If the LED comes on check for a few seconds that the 7805 does not heat up It should stay almost cold Hint The 220 uF capacitor The ...

Page 7: ...At the end of the low voltage circuit build your board should look like this Here is a close up of the regulator Low Voltage Circuit Low Voltage Circuit Regulator ...

Page 8: ...And a close up of the LED Low Voltage Circuit LED ...

Page 9: ...ide is marked with a stripe see hint Put Q1 so that the metal portion lines up with the white stripe on the board The metal side faces to the outside of the board D2 should be placed so that the white stripe on the body lines up with the white stripe on the board Put the micro controller socket in first and solder it Make sure that the depression on the end of the socket lines up with the marking ...

Page 10: ...polarity of your components especially C1 If you have an oscilloscope you can check the voltage at the gate of the MOSFET and it should show pulses of high frequency square wave this is the driver waveform to the HV generator which is being turned off and on by the voltage detection trying to achieve the target voltage 180V default Warning Note also that the Power header also has high voltage expo...

Page 11: ... Hint Mounting the 28 pin socket Mounting the 28 pin socket can be a little difficult A good trick is to fix it in place with a small piece of tape and the solder one leg in place You can hold the socket firm while you wet the solder again which will hold the socket firmly enough to solder the remaining pins One leg is usually enough to hold the socket in place while you solder the others At the e...

Page 12: ...Warning The startup procedure will run over and over again until you tell the clock to move on You can tell the clock to move into normal mode by pressing the button when the tubes show all 8 s 88 88 88 If you do this by mistake and want to go back to the startup procedure you can do a Factory Reset See the user manual to find out how to do this Trouble shooting If any of the channels does not go ...

Page 13: ... RGB LEDs close to the board but be careful not to strain the LED too much Normally it is best to mount the LEDs until the lump in the leads about 3 4mm proud of the board If you mount the LEDs too high the tubes have to be mounted much too high from the board The colon LEDs need to be mounted proud of the board on moderately rigid extension wires It is not easy to estimate the height they should ...

Page 14: ...RGB Backlight LEDs mounted ...

Page 15: ...ime The software controls the rate of the multiplexing and the order in which the anodes are activated Notes The Opto isolators fit into the 24 pin socket snugly Be careful to put them in the right way round The dot denotes pin 1 and should be on the side closest to the edge of the board All 6 should fit perfectly into the 24 pin socket The Opto isolators are socketed because they are sensitive to...

Page 16: ...mal sticky tape to hold things in place while you solder them This makes is easier to solder and gives a better result Place the components and then temporarily tape them into place After this step your board should look like this Using tape to hold resistors in place Anode Control Circuit ...

Page 17: ...t The cathode lit changes rapidly during normal operation because the display is multiplexed Notes Be careful to orient the K155ID1 correctly Place the 16 pin socket and the connector and then put the cathode driver chip on the board in the socket After this step your board should look like this Cathode Control Circuit ...

Page 18: ...imal points and are often removed on the tubes The other pins are given below Pin Connection 1 Anode 2 Left decimal point 3 Digit 1 4 Digit 2 5 Digit 3 6 Digit 4 7 Digit 5 8 Digit 6 9 Digit 7 10 Digit 8 11 Digit 9 12 Digit 0 13 Right decimal point Installing the tubes is quite a fiddly process and it can take a long time and plenty of patience Please see the hints below for some ideas how to make ...

Page 19: ...f you want to test the tube before you finally solder it you can turn the clock on while only the first three pins are soldered and usually all of the segments will work Make sure you don t short out the remaining leads For last resort final small adjustments when all the pins are soldered you can force the tube slightly so the leads give It is best to align the tubes without force IN 14 tubes are...

Page 20: ...ht that the separators should be Notes You can install either LEDs or neons as the colon indicators There is a minor change to the components depending on which you choose For LEDs You need to connect P1 VIN to COM and choose 1k values for R38 and R39 You need to take care of the polarity of the LEDs following what is marked on the board For neons You need to connect 170V to COM and choose 120k va...

Page 21: ... The switch is de bounced in software so practically any switch you want to use is suitable A simple switch is provided in the kit but you might want to substitute this switch with one that suits your case The LDR forms a potential divider with R17 One leg of the LDR must be connected to the input pin the other leg must be connected to GND The LDR should be mounted in such a way that the flat face...

Page 22: ...to read or watch how to do this It is not hard but it takes a knack and some special tools Use thin solder 0 6mm for the SMD components Wet one pad of each SMD component For the resistors and capacitors wet the pad where it will be easiest to slide the component into place For the transistors and the regulator wet the middle pad Use thin tweezers to place the components The ESP 8266 must be mounte...

Page 23: ...at if you have the WiFi option The RTC module has two sets of contacts on it You can use either the side with the pins on it or wire up the other side with flying wires If you use the side with pins you should carefully remove the two unused pins see hint If you use the contacts on the module you should leave CONN_RTC off the board If you receive the connector header as a single strip break off 4 ...

Page 24: ...s is constant but be careful not to set the value too high The longer the On Time the more the MOSFET has to conduct current and this will cause it to heat up A good value for small tubes is 120 150 larger tubes may require 150 200 Trouble shooting The display is too dim Check if the auto dimming is working If the display does not change in low or high ambient light your LDR does not appear to be ...

Page 25: ...ower the value the less power will be used and the less hot the MOSFET will run but also the less power will be available to drive the tubes Check the power supply If the power supply is too strong too much voltage or too much current capacity the MOSFET will have to carry high currents Try a different power supply 9V and 500mA is ideal Change the settings for the PWM On Time Adjust it to be as sm...

Page 26: ...er in order to update the software a standard Arduino UNO is enough To program the 328P simply remove it from the clock board and place it in the Arduino UNO Then you will be able to program the controller as you would any other Arduino UNO simply upload the software onto the controller Put the 328P back into the clock board and you are done You can also program the 328P micro controller with a pr...

Page 27: ...0 R1 1 390k 11 R14 R7 R8 R28 R27 R26 R6 R10 8 3k 12 R13 R12 R9 R11 R3 R19 R18 R23 R20 R21 R22 R24 R25 R29 R31 R32 R33 R34 R35 R36 R37 R4 R5 R15 R16 27 1k 13 R38 R39 2 1k for LEDs 120k for neons 14 R30 R17 2 10k 15 IC3 1 MEGA8 P 328P 16 OK1 OK2 OK3 OK4 OK5 OK6 6 EL817 17 SV1 SV2 SV3 3 4 pin header 18 Q3 Q4 Q5 3 2N7000 19 Q6 1 MPSA42 20 C7 C2 C8 3 100nF 21 LED1 1 LED 3mm 22 L1 1 100uH 23 IC1 1 7805 ...

Page 28: ...optional WiFi module ID Qty Value 1 R40 41 42 43 4 10k 1206 SMD 2 C9 C10 2 100nF 1206 SMD 3 C11 1 10uF 1206 SMD 4 Q7 Q8 2 BSS137 5 U1 1 AP1117 3V3 6 P2 1 2x4 Female Header Revisions V0001 12Jan2018 New manual for Revision 3 ...

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Nixie Clock IN-14 All-In-One, Construction Manual

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