EnviroDIY | ehazard | Activity https://www.envirodiy.org/members/ehazard/activity/ Activity feed for ehazard. Tue, 02 Jun 2026 19:40:13 -0400 https://buddypress.org/?v= en-US 30 hourly 2 308e8500adae67c1a0d5ba59ce2c27c2 ehazard started the topic Changing I2C address of RTC in the forum Mayfly Data Logger https://www.envirodiy.org/topic/changing-i2c-address-of-rtc/ Fri, 07 Aug 2020 04:28:22 -0400 Hello. I’m currently working on trying to take measurements from a CO2 sensor (k30) using my Mayfly data logger (version 0.5b). The sensor is an analog and I’m using the I2C port connected to the SDA and SCL pins on the Mayfly.

The sensor comes preprogrammed with the hexadecimal address 0x68. After quite a bit of testing to attempt to get the…[Read more]

]]> 010999f0901903c91ddd105e06a1e835 ehazard replied to the topic Mayfly SCL and SDA voltage level in the forum Mayfly Data Logger https://www.envirodiy.org/topic/mayfly-scl-and-sda-voltage-level/#post-14451 Thu, 06 Aug 2020 01:02:11 -0400 Hello. I’m currently trying to get a sensor working using I2c protocol, and I have a question about the 2.2 kohm resistors on the SDA and SCL lines. Are those resistances automatically enabled, or is there a line of code that would enable them? Otherwise, if the pull-up resistors are automatically enabled on the Mayfly, is there any way to disable…[Read more]

]]> e15d1eb8e358a42e8ab82825ff0dea80 ehazard replied to the topic XBee Networks of Mayfly Loggers - 900Mhz in the forum Mayfly Data Logger https://www.envirodiy.org/topic/xbee-networks-of-mayfly-loggers-900mhz/#post-12968 Wed, 10 Jul 2019 20:15:23 -0400 Hi Everyone,

I’m working with @dartmouthwsn, the original poster on this thread, to construct a logger network using Mayflys and 900 Mhz XBee Pros. We had the code successfully working so that the logger Mayflys were able to send data to a centrally located node using the Xbee Pros. The code has been functional for several months and was tested a…[Read more]

]]> 7608a4d47f8418712ae129f43bf044b5 ehazard became a registered member https://www.envirodiy.org/activity/p/3830/ Mon, 18 Feb 2019 19:42:52 -0500 0