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hr25_thermostat [2013/11/04 22:31]
GoHoHa [Integrate the additional electronics into the housing]
hr25_thermostat [2013/11/06 20:17] (current)
Inhumierer [Integrate the additional electronics into the housing] typo corrected
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 {{ :​hr25.jpg?​200|Figure 1: Honeywell Rondostat HR25 thermostat}} {{ :​hr25.jpg?​200|Figure 1: Honeywell Rondostat HR25 thermostat}}
-The Honeywell Rondostat HR25 is an electronic ​programmable thermostat for radiators.  +The Honeywell Rondostat HR25 is an electronically ​programmable thermostat for radiators.  
-For integration into an smarthomatic network it needs a RFM12B transmitter and a new firmware. +For integration into smarthomatic network it needs a RFM12B transmitter and a new firmware. 
-To keep the programming scheme similar to other smarthomatic devices, ​ISP connector is added for easy flashing.+To keep the programming scheme similar to other smarthomatic devices, ​an ISP connector is added for easy flashing.
 The housing is hacker friendly, it opens without the risk of breaking it. The housing is hacker friendly, it opens without the risk of breaking it.
-The electronics is based on ATmega329P processor.+The electronics is based on an ATmega329P processor.
 Initial idea is based on the development done for the HR20 thermostat, the OpenHR20 project. Initial idea is based on the development done for the HR20 thermostat, the OpenHR20 project.
  
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 To open the housing, lift the turn wheel with a flat piece of plastic to avoid scratches. To open the housing, lift the turn wheel with a flat piece of plastic to avoid scratches.
 It snaps off and you can look into the device (Figure 2). It snaps off and you can look into the device (Figure 2).
-Than remove the lock pins using the same plastic lever (see Figure 3, arrows to left and right).+Then remove the lock pins using the same plastic lever (see Figure 3, arrows to left and right).
 After pushing the 4 notches (see arrows in figure 5), the housing snaps open.  After pushing the 4 notches (see arrows in figure 5), the housing snaps open. 
 Unscrew the PCB (just 1 screw) and slide it out. Unscrew the PCB (just 1 screw) and slide it out.
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 ==== Integrate the additional electronics into the housing ==== ==== Integrate the additional electronics into the housing ====
  
-If a 2x3 PCB-pin connector is used for ISP, it is possible to hide it behind the turn wheel. This way it it easy accessible for reprogramming and there is little to no need to modify the housing or PCB((An other option would be to sacrifice the JTAG connector, cutting and wiring some connections.)).+If a 2x3 PCB-pin connector is used for ISP, it is possible to hide it behind the turn wheel. This way it it easy accessible for reprogramming and there is little to no need to modify the housing or PCB((Another ​option would be to sacrifice the JTAG connector, cutting and wiring some connections.)).
  
 The RFM12B fits well inside the thermostat housing between display and PCB. The RFM12B fits well inside the thermostat housing between display and PCB.
hr25_thermostat.1383600703.txt.gz · Last modified: 2013/11/04 22:31 by GoHoHa