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Construire une sonde de température radio pour moins de 7€ -

Construire une sonde de température radio pour moins de 7€ -
Le principe L'Arduino Pro Mini (petit carré noir avec tout plein de pattes) va aller interroger toutes les 3 secondes le capteur DS18B20 (plus petit carré noir à trois pattes, en forme de transistor) afin de récupérer la température de la pièce, puis va envoyer, à travers l’émetteur RF 433 mHz (petit circuit à 3 pattes), l’information au Raspberry PI. Le Raspberry PI, qui écoute en permanence les ondes radio à travers son récepteur RF 433 mhz, va détecter le signal, récupérer la température et la donner à une page PHP qui va la stocker dans un petit fichier texte (au format json), accessible depuis l’interface web et depuis Yuri. Sur le serveur web du Rapsberry PI, l’interface va aller récupérer en ajax toutes les 3 secondes la valeur du fichier texte pour chaque sonde radio et l’afficher sur la page. Le matériel 1 Alimentation de portable 1,63€ Des fils de liaisons pour 1,37€ les 40 Soit 11,29€ pour le premier, et 6,32€ pour les Mini Arduino Pro suivants. Programmer la puce Atmega

Related:  RF 433MhzArduino - ProjectsRaspberry Pi - Projects 1Hardware

Keep the WiFi On There are times you are unable to connect to your WiFi router. This can be especially problematic when you have increasing number of WiFi dependent IoT devices. Many times, the remedy is to simply reboot the router i.e. unplug the power cord, wait for a few seconds and plug it back again. If you do not want to go through that trouble on the ongoing basis, this apparatus will keep an eye on the wifi connectivity. If the connectivity goes down, it will turn on the buzzer to give warning to the user, then it will turn the router off for a predefined time using a relay.

The Shrimp The Shrimp circuit is an Arduino Uno substitute with a component cost of around one tenth the price of official Arduino boards. You can hand-make the circuit on breadboard or stripboard, learning about the components as you go, and remix the circuit freely for your needs. There’s more about the design below. If you like the approach, there’s details of costings and how to source your own components at the recipe page or buy prepared kits from us. Makers can use the diagrams on our site to construct a Shrimp, starting with the Blink build sequence. If you’re in Morecambe, or generally in the UK, we can teach you to build and program your Shrimp at the Shrimping Workshops.

Arduino Environmental Monitoring v1 About Well, weather stations are far away, and you'd probably like indoor monitoring, but most of the times off the shelve equipment is more expensive and offers more accuracy than needed. This is much less accurate than most weather stations. Arduino Well, you could do this with any dev board. But, Arduino is one of the cheapest and also one of the most heavily documented - and Mega2560 is suitable for these many sensors. s Raspberry Pi Lesson 4. GPIO Setup One of the great things about the Raspberry Pi is that it has a GPIO connector to which you can attach external hardware. The GPIO connector actually has a number of different types of connection on them. There are: True GPIO (General Purpose Input Output) pins that you can use to turn LEDs on and off etc. I2C interface pins that allow you to connect hardware modules with just two control pins SPI interface with SPI devices, a similar concept to I2C but a different standard Serial Rx and Tx pins for communication with serial peripherals

Sunfounder Project Arduino USB Freeform Arduino This is a project in attempting to improve it predecessor "Freeform Arduino" by putting it in an enclosure and having it servethe similar purposes as "Palm Arduino Kit" and "Palm Arduino II" which I can carry it in my pocket and be available touse,and to connect to easy available power source specifically USB port. .I designed this "USB Freeform Arduino" with USB connector to be enclosed inside a 35mm film canister. The biggest challenge is how I couid fasten the "none PCB Arduino" to it own enclosure, in this case cylinder shape canister? The answer was not an easy one. But the solution I found was an easy thing to do, and it was an excellent solution that

LightwaveRF RF Protocol - about:benjie Following on from yesterday’s success, I’ve done a big data capture of various commands and have figured out (mostly) the protocol. As you saw yesterday, each command comprises 10 bytes. But actually, each of these only ever take one of 16 values, thus they really represent nibbles. The values of these nibbles are: Then the payload is made out of 10 of these nibbles. Level (2 nibbles) LedMatrix Tweet Visualization Description Display tweets with a certain hashtag on a led-matrix using an Arduino/Genuino Yùn or Yùn-Shield. We will use a Python script to log into twitter and check for updates. Configuring the Yun101/YunShield

learn.adafruit Stepper motors fall somewhere in between a regular DC motor (Lesson 9) and a servo motor (Lesson 8]). They have the advantage that they can be positioned accurately, moved forward or backwards one 'step' at a time, but they can also rotate continuously. In this lesson you will learn how to control a stepper motor using your Raspberry Pi and the same L293D motor control chip that you used with the DC motor in Lesson 9. Arduino Low Power - How To Run ATmega328P For a Year On Coin Cell Battery An Arduino Uno runs less than one day on a 9 V battery because it uses about 45 mA current. Using an Arduino Pro Mini, with a simple modification, the power consumption goes down to 54 μA (0.054 mA) with the 3.3 V version or 23 μA (0.023 mA) with the 5 V version, in power-down sleep. That is 4 years on a 9 V battery with 1,200 mAh capacity or 2,000 times more efficient than the Arduino Uno. After removing the voltage regulator, the power consumption is only 4.5 μA for the 3.3 V version and 5.8 μA for the 5 V version, in power-down sleep.

Smoke Detection using MQ-2 Gas Sensor In this example, you will read the sensor analog output voltage and when the smoke reaches a certain level, it will make sound a buzzer and a red LED will turn on. When the output voltage is below that level, a green LED will be on. What is an MQ-2 Smoke Sensor? The MQ-2 smoke sensor is sensitive to smoke and to the following flammable gases: LPGButanePropaneMethaneAlcoholHydrogen The resistance of the sensor is different depending on the type of the gas.