At the same time, we have used DesignSpark PCB to design the circuit as well. The resistor used is to set the gain desired. The instrumentation INA125P is used to amplify the data gathered from the load cell. We have prototyped the circuit on the strip board to amplify and process the data gathered from the load cell. The wood piece can be put into a mail box to detect the letters present. There are four small wood squares at the corner to support the wood piece. This will be detected by the load cell located underneath the wood. This is because the wood piece is very thing, any weight acting on it will cause slight bent in the wood. We have used a very thin piece of wood to be the base. Whenever the difference in the weight is higher than the threshold value, it will cause the number of letter increase. In this project, we have used a load cell to measure the difference in the weight.
#Arduino facebook notifier full
It is a full Wheatstone Bridge circuit that gives more accurate readings. The following schematic shows the internal connection of the load cell. The FX1901 is a 1% load cell device with full scale ranges of 10, 25, 50 or 100lbf compression. The FX1901 units are intended for OEM use in laboratory, hospital or consumer product applications, establishing a breakthrough price/performance value for compression load cells. This keeps the pin layout intact and allows another shield to be stacked on top. The Wi-Fi shield connects to an Arduino board using long wire-wrap headers which extend through the shield. An AT32UC3 provides a network (IP) stack capable of both TCP and UDP. It is based on the HDG104 Wireless LAN 802.11b/g System in-Package. The Arduino Wi-Fi Shield allows an Arduino board to connect to the internet using the 802.11 wireless specifications (Wi-Fi). It contains everything needed to support the microcontroller simply connect it to a computer with a USB cable or power it with an AC-to-DC adapter or battery to get started. It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz ceramic resonator, a USB connection, a power jack, an ICSP header, and a reset button. The Arduino Uno is a microcontroller board based on the ATmega328. Based the number of increasing above the threshold in the reading, we will be able to know the number of letters present in the mail box.
The hardware circuit detects the weight in a letter box. The Internet of Things (IoT) function is being enabled by an Arduino Wi-Fi shield.
The project is being developed on the open sourced Arduino Platform.
In this project, it will automatically filter away the flyers and count the number of letter and upload the data online. With the support of this project, you can access the status of your mail box from your office, on the way home or even when you are overseas. Have you ever been bothered to check your mail box daily when you having important letters coming in? How do you feel when you open the box but there is no expected letters? This is the idea behind this Mail Box Notification Project.
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