for the SEN-15901 Weather Counter Kit and in particular for the weather vane. For the 16 possible positions, what is the value of the resistance measured between pins 1 and 4 of RJ11 :?:
Check the data sheet that’s available in the documents tab, that has a chart of resistances.
Also just so you know, 16 positions are possible, but you will probably only ever see 8 positions. (N, NE, E, SE, S, SW, W, NW.) The missing 8 positions are included in the unlikely case that more than one switch closes at a time inside the wind vane.
j’ alimente la girouette en 3.3V et non pas 5V comme dans le document. je comprends que les valeur de résistances reste identique mais la résistance du pont diviseur ne doit pas être la même?
Pour le pluviomètre la tension d’alimentation est aussi de 3,3 V la valeur de la résistance et du condensateur indiqué sur le schéma ne sont peut être pas les mêmes et le schéma ne précise pas la position de l’entrée sur la carte de traitement et si il y a des risques de rebond sur cette entrée et si oui comment s’en prémunir.
Pour l’anémomètre l’alimentation est aussi en 3.3V et la documentation indique pour un vent de 2.4 Km/h le contact se ferme toutes les secondes. Donc pour 240 km/h le contact se fermera 100 fois par seconde. Un ESP8266 monté sur un ESP 12E et intégré sur une NodeMCU le tout monté sur une carte d’extension est-il en capacité d’enregistrer tous ces battements. Un rebond sur l’entrée est-il a craindre et si oui comment s’en prémunir.
cordialement
:?:
I supply the wind vane with 3.3V and not 5V as in the document. I understand that the resistance value remains the same but the resistance of the divider bridge must not be the same?
For the rain gauge the supply voltage is also 3.3 V the value of the resistor and the capacitor indicated in the diagram may not be the same and the diagram does not specify the position of the input on the control board. treatment and if there is a risk of rebound on this entry and if so how to protect yourself.
For the anemometer, the power supply is also at 3.3V and the documentation indicates for a wind of 2.4 km / h the contact closes every second. So for 240 km / h the contact will close 100 times per second. An ESP8266 mounted on an ESP 12E and integrated on a NodeMCU all mounted on an expansion card capable of recording all these beats. Is a rebound on the entrance to be feared and if so how to protect yourself from it.
cordially
The resistance value for the wind vane changes depending on what cardinal direction the wind vane is pointed. When connected to an external resistor, you end up creating a [voltage divider and the resistance value of the wind vane combined with the external resistor will give an output voltage you can measure with a micro controller to determine what direction the wind is coming from.
For example, if you use a 4.7K external resistor, and the wind vane is at zero degrees (33K ohms) AND you’re using 3.3 volts to ‘power’ the voltage divider circuit, you will get an output voltage of 1.36 volts. Move the wind vane to 45 degrees, (8.2K) and your output voltage changes to 0.49 volts.
I’m not sure what you mean about “rebound” I’m going to assume you are referring to inductive kick back. The rain gauge, anemometer and wind vane have no coils or inductors in them so there is no danger at all of inductive kick back. All three can be connected to your micro controller without any fear of causing damage.](Voltage Dividers - SparkFun Learn)