Automation for awning


image of an awningA few years ago, I bought an electric awning ( no manual control via a crankshaft on this model ... ) equipped with a single radio control. The wind / sun sensors are not integrated into the system as in the case of SOMFY.
Considering the weather conditions here in Lorraine, I decided to undertake the construction of a small automated system.

smileI offer you in the links below the various notices in PDF format of my store ( 5x3m Sunstyl model purchased from Leroy Merlin in 2003 ):

After long research, it turns out that my box type blind 125 is powered by a TELCO brand motor., and is distributed by the Stores Décor Service Company as well as by the English firm Torbay Blinds .

Specifications :

The automation must allow control of the awning motor depending on the weather conditions:

  1. Rain
    1. in the event of rain, immediate retraction of the awning.
      A red LED lights up, any descent order is then prohibited.
      This action is a priority.
    2. The rain stops, the sensor dries up and the red 'Rain' LED flashes.
      The descent order is always impossible during this time.
    3. After 15 'of no rain, the red' Rain 'LED goes out.
      The awning can then lower either automatically if it is sunny, or manually.
  2. Sun
    1. in the event of sun appearing ( with brightness greater than the set threshold ) a yellow 'Sun' LED lights up. After 3 ', the blind goes down.
    2. During a small cloudy period of less than 15 ', the yellow' Sun 'LED flashes.
      The blind does not go up.
    3. If the sun disappears more than 15 '( heavy cloud or night ), the yellow' Sun 'LED goes out and the blind goes up.
  3. Wind
    1. The wind picks up ( with a speed greater than the set threshold ).
      Immediately, the red 'Wind' LED lights up and the blind goes up.
      Any descent order is then, for safety, prohibited.
      This action is a priority.
    2. The wind calms down. The red 'Wind' led flashes.
      The descent order is always impossible during this time.
    3. After 12 'of no wind, the red' Wind 'led goes out.
      The awning can then lower either automatically if it is sunny, or manually.

In fact, if the awning is manually raised during bright sunshine, the system will have to perform a new series of sunshine measurements, see §II.1-3, subject to other conditions ...

Most of these instructions come from of SOMFY specifications, and seem interesting to me. Nothing prevents them from being modified either from the design stage, or later by updating the software, I will provide an ICSP interface ( In Situ Programming ) for this purpose.

The system must also include a switch to inhibit the automation , and display the active state of the processor through Led_Reset, which should light up briefly every 10-15 seconds to signal this state.

The system will be connected to the radio control box oforigin (433.92 MHz ). This assumes interfacing using relays.

The automatism will have priority in its given orders. The action of the remote control must therefore be inhibited while the system is being operated, and until one of the priority instructions disappears.

I opted for a modular system for several reasons:

  • have the possibility to install the options of your choice
  • allow easy troubleshooting and / or replacement of each module
  • have the future possibility of adding other options ( in the idea of ​​a small weather station for example ... )
  • why not upgrade an analog module to all digital

The significant counterpart is the important wiring due to the multiplicity of plates. However, this is the solution I adopted because the 3 modules ( Wind, Rain, Sun ) will be on the roof, probably near a gutter, and the management board with its power supply inside my basement. The boxes chosen to house the sensor plates ( Bopla Euromas) are all sealed ( IP65 ), and the cable outlets will be through cable glands.

Food :

The assembly is supplied with power through a voltage regulator for 5V, with 12V coming from a supply circuit common to all the modules. For reasons of performance and beyond energy saving, I have indeed opted for a power supply type SMPS. This type of power supply operates with an efficiency of more than 80%, displays a minimum of losses and overheating, and offers protection against overvoltages, all this thanks to high performance components. In addition, their operating range is wide (from 85 to 264V approximately, and at a frequency of 47-63Hz), which allows use in all latitudes!

Production :

All the plates that I had manufactured ( not being equipped for this ... ) are made of double-sided epoxy, and require certain welding precautions, in particular the double-sided passages ( vias ) because there is no no metallic holes. I did not pay attention to this when routing, so that soldering terminal blocks or tulip supports for example is sometimes more than delicate ... I strongly advise you to equip yourself with a good soldering iron! Mine is a thermostatically controlled Weller...

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