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hacking_an_eq-3_model_n [2016/03/21 23:48]
Traumflug [Goal of the Hack]
hacking_an_eq-3_model_n [2016/03/22 15:18]
Traumflug [The Hack in Pictures] Last words :-)
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 | {{ :​eq-3:​eq-3_model_n.jpeg?​direct&​200 |This is the Model N as it comes out of the box.}} | {{ :​eq-3:​eq-3_model_n_cover_removed.jpeg?​direct&​200 |The same with housing removed.}} | | {{ :​eq-3:​eq-3_model_n.jpeg?​direct&​200 |This is the Model N as it comes out of the box.}} | {{ :​eq-3:​eq-3_model_n_cover_removed.jpeg?​direct&​200 |The same with housing removed.}} |
-| {{ :​eq-3:​eq-3_model_n_actuator_visible.jpeg?​direct&​300 |Looking from the side, one can see the valve actuator. The slightly hidden tin can is a simple DC motor, driving the gearbox right of it. The right end of the gearbox is to be mounted on the radiator valve.}} | {{ :​eq-3:​eq-3_model_n_circuit_board.jpeg?​direct&​300 |This is the circuitry board of the Model N. Noticeable dirt on this brand new device. For details, see the following description.}} |+| {{ :​eq-3:​eq-3_model_n_actuator_visible.jpeg?​direct&​300 |Looking from the side, one can see the valve actuator. The slightly hidden tin can is a simple DC motor, driving the gearbox right of it. The right end of the gearbox is to be mounted on the radiator valve.}} | {{ :​eq-3:​eq-3_model_n_circuit_board.jpeg?​direct&​300 |This is the circuitry board of the Model N. No components other than the dial encoder on the back side. Noticeable dirt on this brand new device. For details, see the following description.}} |
  
 ==== Actuator Motor ==== ==== Actuator Motor ====
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 During the modification a lot of pictures were taken, so let's speak these. During the modification a lot of pictures were taken, so let's speak these.
  
-picture ​picture ​|+{{ :​eq-3:​eq-3_model_n_thermistor_removed.jpeg?​direct&​300 |First step is to remove the Thermistor. Try to heat it on both sides, then shove it away.}} | {{ :​eq-3:​eq-3_model_n_wires_instead_of_thermistor.jpeg?​direct&​300 |Then solder a wire to each of the pads. Requires lots of flux and a steady hand :-)}} | 
 +| {{ :​eq-3:​eq-3_model_n_wire_hole.jpeg?​direct&​300 |Drill up one of the venting holes in the battery cover. Wires will go through here.}} | {{ :​eq-3:​eq-3_model_n_wiring.jpeg?​direct&​300 |Then make a knot into the wire pair and run it through the cover hole. This means to be a stress relief, so you don't rip the circuitry apart if you accidently trip over the wire.}} | 
 +| {{ :​eq-3:​eq-3_model_n_thermistor_on_wire.jpeg?​direct&​300 |After doing the wiring on the PCB side, solder the thermistor removed earlier back onto the other end of the wire pair. Again, this might take a few tries.}} | {{ :​eq-3:​eq-3_model_n_thermistor_insulated.jpeg?​direct&​300 |As you might mount the thermistor to some metallic surface, insulation of that is a good idea. This is Kapton tape, but its high temperature resistance isn't needed here.}} | 
 +| {{ :​eq-3:​eq-3_model_n_ready_with_external_thermistor.jpeg?​direct&​500 |Assemble everything back together and you're done. That's how the EQ-3 Model N with DIY'd external thermistor looks like.}} ​||
  
 +With all this done, the Model N works just as before, just room temperature can be measured on a more meaningful position.
 ===== How the Result Works ===== ===== How the Result Works =====
  
hacking_an_eq-3_model_n.txt · Last modified: 2018/05/27 16:10 (external edit)