Hello, I am new to this group and I would like to introduce myself with a project that I have been working on.
This is my attempt to create a DMM using IN-12s, a IN-15A and a IN-15B as display. I used my nixie clock board as base, so it can double as a clock when not used as multimeter =) http://tobiasmugge.files.wordpress.com/2012/05/dscn4039.jpg http://tobiasmugge.files.wordpress.com/2012/05/dscn4034.jpg The uC is a Atmel Atmega328p. I downloaded arduino bootloader on it. I am using supertex HV5522 as drivers for the nixies. Two of them for 64bits. A friend of mine wrote a library for it that includes brightness control via the HV5522 blank pin. He is currently programming the clock while I work on the DMM. Power consumption is around 3W. DC power supply from 9 to 12V. The voltage for the tubes is boosted from the input voltage using a switch- mode power supply based on the TubeHobby one. The pictures and video shows voltage reading: is the only measurement I implemented on the software so far. Still thinking how to approach the scales/units. I have a shunt resistor on the board and I plan on having voltage, current, power, frequency and duty cycle for DC. I am using a I2C A/D with a PGA, measuring voltage on both sides of the shunt. This was a fairly cheap solution, but the way I did it only works for DC and the range is 0 to 32V. But allows me to measure current and voltage at the same time =) I have a video of the thing working: http://www.youtube.com/watch?v=PNYnFTeADow The maximum error I measured was 1,2% when comparing to my not-that- bad-multimeter. I plan on implementing resistance, capacitance, inductance and AC voltage/current capabilities. Suggestions will be greatly appreciated! The IN-15A showed on the pictures is not fully lightened. I am following Nick suggestion to burn it at 6mA for one hour. So far so good. I am still trying to find some IN-12B as those include the dot. I do have 4 bits free on the HV5522 that I could use to drive IN-12B dots or INS-1. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to neonixie-l@googlegroups.com. To unsubscribe from this group, send email to neonixie-l+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
