DIN Rail LEGO
A LEGO set:
That looks really good. Did you made an estimate of the average cost of single node?
@gohan Price is very depends on volume. 10 pcbs are costing me $10 for the set while 50pcs costing $15
Etc. 4pcb for the unit is $1.2-4
The rest is BOM, also very depends on volumes and on a unit specific details.