I finished soldering the Velleman MK120
receiver I will use for detecting the lightpulses from
the electricity meter for the one wire electricity
. I think that is the first soldering of a
circuit board since somewhere around my electronics education which
finished in 1989 and I did it right! The circuit works as designed: it needs a
strong infrared signal to not send out a signal via led and buzzer.
I did not solder the buzzer because eventually the signal needs to go into
the 1-wire counter and buzzing sounds from the cupboard under the stairs might
get irritating fast. After checking whether the circuit board worked as
designed I swapped the inputs on the comparator like in the
1-wire electricity monitoring design by Jon00
. I did not cut traces and solder wires, I used the
IC holder to set up 2 crossed wires to the pins of the IC.
In testing I found that the L-53P3C photodiode is very good at receiving
infrared, but the red led in our electricity meter does not emit enough
infrared light to trigger the circuit. I think I'll need to find a
different photodiode which is more sensitive for visible (or just red) light.