There are several makes of the SHT21 one is fitted on a small SMD print, but an other on has an elongated print with header pins. Further there is a Arduni compatable and an I²C compatable type. I am busy to re-develop the original design to extend it with a real time clock as a reference for shut off the nixies at night a nightly scan of the nixies to avoid cthode poisoning, a PIR sensor to activate the hv when a person enters the room or unit at darkness. Fianlly I use the more charming IN17 instead of the IN14's that have became scarse and expensive. The high voltage will be derived from the more efficiënt and smaller Taylor supply. The sensor comes outside the case to get a more reliable read-out (no warming up by the components inside) or in a 'tunnel' with mechanic ventilation.
eric -----Original Message----- From: neonixie-l@googlegroups.com [mailto:neonixie-l@googlegroups.com] On Behalf Of John Rehwinkel Sent: zaterdag 10 mei 2014 13:57 To: neonixie-l@googlegroups.com Subject: Re: [neonixie-l] Nixie thermometer in Elektor journal > sorry for opening an old post (2012?) but I couldn't see any others and didn't think it with opening a new thread. > I'm not the smartest hobby electronics person but I do enjoy tinkering > : ) I have been building one of these to add to my small (so far) collection of nixie clocks etc. > > I have the main pcb finished and need to mount the sensor to it's pcb. > Because it is smd I want to use the 'heated skillet and solder paste' method but I am not sure which way to orientate the chip to the board. This is the one with the SHT21 sensor on the little daughter board? The NC pins are pins 3 and 4, and the unconnected pads are the ones toward the through-hole pins. To put it another way, the notch (cut corner) on the die pad on the bottom should point away from the through hole pins, and the sensor opening on the top of the chip should point toward the through hole pins. > Can anyone advise please particularly if they have a photo of one? I consider myself to be Kinesthetic as I learn and understand better by watching rather than reading or hearing hence the photo would be good. I don't have this kit, so I can't take a photo, but if it would help, I can make up a diagram showing the placement of the chip. - John -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/A571EAAE-4E87-45C7-BA83-AB38B49 E893B%40mac.com. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/!%26!AAAAAAAAAAAYAAAAAAAAAPDddShx705MuX20yCpp0vvCgAAAEAAAAIHFbEvmV5JEkN66E75a3%2BcBAAAAAA%3D%3D%40zeelandnet.nl. For more options, visit https://groups.google.com/d/optout.
