EnviroDIY | John | Activity https://www.envirodiy.org/members/johnmcdaris/activity/ Activity feed for John. Thu, 21 May 2026 21:57:33 -0400 https://buddypress.org/?v= en-US 30 hourly 2 bd28f4554a7c6af53e8a19a236e6ac94 John replied to the topic Hyrdos 21 Gen2 - Can't Change Address in the forum Environmental Sensors https://www.envirodiy.org/topic/hyrdos-21-gen2-cant-change-address/#post-17782 Wed, 03 May 2023 16:47:22 -0400 Thanks, Shannon.

I did double check the things you mentioned.  And as I said, this whole setup just worked when I did it with different gen 2 Hydros sensors in January.  Still not having any luck.

Are there other things to try?

]]> 23360f6c38defc2da026647b4ec068c9 John started the topic Hyrdos 21 Gen2 - Can't Change Address in the forum Environmental Sensors https://www.envirodiy.org/topic/hyrdos-21-gen2-cant-change-address/ Mon, 01 May 2023 20:54:01 -0400 I have some new METER Hydros 21 (gen 2) sensors and I want to hook them up to my Mayfly to calibrate them against some known standards before I deploy them.  The problem is that the b_address_change sketch (https://envirodiy.github.io/Arduino-SDI-12/b_address_change_8ino-example.html#xample_b_page) can’t seem to determine what address the sensor…[Read more]

]]> d486b151a5a6f5972c4be1c6e3da6f19 John replied to the topic Problems with a combined MH21 Gen1 and Gen2 station in the forum Mayfly Data Logger https://www.envirodiy.org/topic/problems-with-a-combined-mh21-gen1-and-gen2-station/#post-17345 Mon, 19 Sep 2022 15:17:20 -0400 Ah!  Some pieces are coming into clearer focus.

Thanks!

]]> dda20abeee00091f656e5b4b1a013d73 John replied to the topic Problems with a combined MH21 Gen1 and Gen2 station in the forum Mayfly Data Logger https://www.envirodiy.org/topic/problems-with-a-combined-mh21-gen1-and-gen2-station/#post-17343 Mon, 19 Sep 2022 14:39:22 -0400 Thanks, Shannon.  I think I get it.  🙂

Just out of curiosity, is this new?  Or is it something that just became an issue because of trying to run the two different generations of sensor that way?  It was working fine with the two Gen1 sensors written as it is.  I suppose I’m trying to figure out if I just got lucky originally.

]]> 1a5a8ad3980f9d2b898640744a793f97 John started the topic Problems with a combined MH21 Gen1 and Gen2 station in the forum Mayfly Data Logger https://www.envirodiy.org/topic/problems-with-a-combined-mh21-gen1-and-gen2-station/ Mon, 19 Sep 2022 12:22:57 -0400 Hey all.

I have a station that started out with two Gen1 METER Hydros 21s and has transitioned to having one  Gen1 and one Gen2.  Unfortunately, I can’t seem to get the sketch to work now even though it was before.  It compiles and uploads to the card, and the Gen1 sensor does just fine but I get -9999 from the Gen2 now that it’s installed.  Whe…[Read more]

]]> 1509edbbc4d4277fbb1b34bfca326c21 John became a registered member https://www.envirodiy.org/activity/p/5887/ Mon, 08 Feb 2021 18:03:48 -0500 0