07:51 <mtrbot-ml_> [mattermost] <hartytp> I don’t think we need offset calibration

07:52 <mtrbot-ml_> [mattermost] <hartytp> Will have a look at the code at some point today but I think we can scrap the cal

07:53 <mtrbot-ml_> [mattermost] <hartytp> Otherwise sounds great

07:54 <_whitenotifier-3> [smoltcp] whitequark commented on issue #326: How to integrate into Android VPNService? - https://git.io/JvMjc

10:20 <mtrbot-ml_> [mattermost] <hartytp> @astro btw are you seeing any checksum or readback errors atm?

10:28 <mtrbot-ml_> [mattermost] <hartytp> Does gitea have the nice git hub functionality line copying code blocks in a readable way?

10:28 <mtrbot-ml_> [mattermost] <hartytp> @astro why the retries here? https://git.m-labs.hk/M-Labs/thermostat/src/branch/master/src/ad7172/adc.rs#L32

10:29 <mtrbot-ml_> [mattermost] <hartytp> are those needed still? IIRC there was an issue on the V1.0 hardware because a zener pulled the 3v3 rail too low so the SPI bus wasn't reliable. If it's not 100% reliable now then it's a serious issue that we should address

10:30 <mtrbot-ml_> [mattermost] <hartytp> (or could just be a timing issue after the reset or something like that)

10:30 <_whitenotifier-3> [smoltcp] fbzhong commented on issue #326: How to integrate into Android VPNService? - https://git.io/JvDfA

10:30 <_whitenotifier-3> [smoltcp] fbzhong commented on issue #326: How to integrate into Android VPNService? - https://git.io/JvDfx

10:31 <_whitenotifier-3> [smoltcp] fbzhong commented on issue #326: How to integrate into Android VPNService? - https://git.io/JvDfp

10:37 <mtrbot-ml_> [mattermost] <hartytp> I don't think that's surprising. In the data sheet it says that the offset reg defaults to 0x800000 (i.e. the real offset is effectively offset - 0x800000)

10:43 <mtrbot-ml_> [mattermost] <hartytp> If I'm reading the data sheet correctly then the uncalibrated offset is 40uV, which is 12ppm. Thermistors are typically -4%/C so 40ppm/mK. i.e. the offset corresponds to an absolute measurement error of less than 1mK. I haven't seen many thermistors that are accurate out of the box to much better than 100mK. also, the ladder resistors are 1000ppm (0.1%) tolerance IIRC. So whateve <message clipped>

10:45 <mtrbot-ml_> [mattermost] <hartytp> BTW the calibration I was referring to was just the TEC driver, not the ADC (the TEC driver is much less accurate since designed to operate closed loop )

13:08 <_whitenotifier-3> [smoltcp] fbzhong deleted a comment on issue #326: How to integrate into Android VPNService? - https://git.io/JvDfp

13:08 <_whitenotifier-3> [smoltcp] fbzhong deleted a comment on issue #326: How to integrate into Android VPNService? - https://git.io/JvDfx