Temperature/Humidity Sensor
It's sitting in another room right now but I'll get it set up outside today.
Next on the list is an analog expansion module that will be able to read the soil moisture sensor. Right now I have to go outside with a multimeter and measure the voltage which varies between 0.00 - 3.00 VDC with 0.00 being dry as a bone and 3.0 being wet as can be.
Went out and looked at the garden last night after work and the freshly seeded bed was patchy, wet/dry so I hit it with the overhead micro-sprinklers for 5 minutes. I'm going to set up timers for a few 5 minute sessions per day. 9am before the sun hits, 3:30pm when it's starting to get patchy afternoon shade and again at 9pm. The analog stuff is expensive, $330 for the module, so I won't be getting one for a while. Wouldn't help me right now anyway because there's no way of knowing what a particular voltage means.
It's not something the makers of it can tell you because it depends on what kind of soil you have. Heavy soil doesn't release it's moisture to a plant like light soil does so 1.70 vdc in sand is different than 1.70 vdc in clay. I'm recording voltage readings with comments on how wet or dry the soil is at the various readings. By the time I get an analog input module, I'll know, it's time to water at 0.87 vdc etc.
Today, I weld tunnel frames
Hopefully I'll get them all welded and sprayed with rust treatment to take care of the surface rust today. Tomorrow, prime with "rusty metal" primer and paint them white. Then I have Sat/Sun/Mon off with 60 degrees and sunny to get them in the ground.
It's time to start shopping for poly film to cover it. Hopefully I'll find an end of the year sale.