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Forget about "high end grow controllers" (its pricly junk) . All we need is two sonoff's wifi devices, model POW (with power monitoring) for light cycle timer and power measure. And model TH16 (double relay) with plug for temperature nad humidity monitoring (i2c so You can attach more sensors...

Yes it's clu048-1212, I buy heatsinks on ebay ( for older type computer cpu)

I work on a cheap controller that manages the power and time of lighting the lamps. The basic functions are: - Light Timer - PWM power control (theoretically you can control any number of Meanwell type B power supplies) - Power meter A few similar projects can be found here on the forum, but...

Buy a ordinary CPU cooler, it's very cheap, bigger is better. Mine is GlacialTech igloo 1100cu with copper core ( cost about 4$)

For seedling you don't need a huge amount of lumens, just use two LED bulbs (>10W, cold color temperature) per plant.

You can use GSM module from ebay or aliexpress, it's very cheap < 10 $ from China. Actually i working on similar project using LoRa transmission, but again it has limited range (about 2km). My project is based on Arduino, which controls lights, temperature, humidity, fans. The LoRa signal is...