RF 434MHz ASK Transmitter and Receiver

1. Description

This tutorial shows how to establish a basic RF communication link using cost effective wireless modules (434 MHz transmitter and receiver). The use of low-cost RF modules could be practical in systems with multiple remote sensors and/or other remote devices. On the other hand, this type of modules do not offer advanced security features as it might be the case for the more expensive RF modules.

Difficulty level: beginner.

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Standalone ATmega328P-PU w Reset Button and LED

1. Description

This tutorial shows how to setup a standalone ATmega328P-PU microcontroller (breadboard or PCB) in an Arduino compatible mode.
The microcontroller should be pre-loaded with the Arduino bootloader in order to be able to easily upload Arduino
sketches using an additional Adruino board. The setup helps to reduce costs and power conpsumtion, in particular for
remote devices (i.e. remote sensors).

Difficulty level: intermediate.

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Temperature and Humidity Sensor to HTML using JavaScript gauges

1. Description

This is a slightly variation of the setup in the previous post (Sensor Reading Part 2: Temperature and Humidity Sensor to HTML). Readings from a DHT11 temperature and humidity sensor are periodically sent to the client’s browser and displayed using JavaScript gauges. The webpage is hosted on a SD card, data refresh in the client browser is performed through AJAX and XML.

Difficulty level: intermediate.

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Temperature and Humidity Sensor to HTML

1. Description

The setup allows periodic readings from a DHT11 temperature and humidity sensor using an Arduino Uno development board and an Ethernet shield. Sensor readings (temperature and humidity) as well as computed values (heat indexes) could be accessed via a minimalist webpage hosted on a SD card. The webpage refreshes sensor data using AJAX and XML.

Difficulty level: intermediate.

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Temperature and Humidity Sensor to Serial Monitor

1. Description

Basic setup allowing periodic readings from a DHT11 temperature and humidity sensor using an Arduino Uno development board. Sensor readings (temperature and humidity) as well as computed values (heat indexes) are printed to the serial monitor.

Difficulty level: beginner.

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