The aim of this research is to design a semi-automatic nutrient pH control system based on NodeMCU EPS 8266 in the NFT hydroponic system on pak choy (Brassica Rappa L.) as an experimental plant. The research was carried out from 20 June to 17 July 2023. The implementation was carried out at the Santoso Berkah Hydroponic Garden, Palembang City, South Sumatra Province, precisely on Jl Kemuning Di…