Embedded - ->for u

👉 In this circuit LED’s (D1-D10) displays the capacity of the battery in either dot mode or display mode . This mode is selected by the external switch sw1 which is connected to 9th pin of IC.  👉 6th and 7th pins of IC are connected to the ground through a resistor. This resistor controls the brightness of LED’s. 👉 Here resistor R3 and POT RV1 forms potential divider circuit. Here pot RV1 is used for calibration. There is no need of any external power supply to this circuit. 👉 The circuit is designed to monitor 10V to 15V DC. The circuit will work even if the battery voltage is 3V. The operating voltage of this IC is 3v to 25v DC. 👉 This circuit is most suitable for indicating 12V battery level. In this circuit each led indicates 10 percent battery level. 

Circuit Components 👉 LM3914 IC 👉 LED’s -10 (Red – 3, Yellow – 4, Green – 3) 👉 SPST Switch 👉 Resistors – 18KΩ, 4.7KΩ, 56KΩ 👉 Potentiometer – 10KΩ12V 👉 Battery (to test) 👉 Connecting wires

Battery Level Indicator 👉 Battery level indicator indicates the status of the battery just by glowing LED’s. For example six LED’s are glowing means battery capacity 60% remains. 👉 The heart of this battery level indicator circuit is LM3914 IC. This IC takes input analog voltage and drives 10 LED’s linearly according to the input analog voltage.  👉 In this circuit, there is no need of resistors in series with LEDs because the current is regulated by the IC.

Not every DIY project requires a microcontroller.. This is an easy DIY project.. Just you can even try it out on a breadboard.. Only way to learn is by start doing..

What is LoRaWAN™? 👉 The LoRaWAN open specification is a low power, wide area networking (LPWAN) protocol based on LoRa Technology. 👉 Designed to wirelessly connect battery operated things to the Internet in regional, national or global networks, the LoRaWAN protocol leverages the unlicensed radio spectrum in the Industrial, Scientific and Medical (ISM) band. 👉 The specification defines the device-to-infrastructure of LoRa physical layer parameters and the LoRaWAN protocol, and provides seamless interoperability between devices. 

An app note from Semtech stating use of LoRa in Smart Parking..

What is LoRa®? 👉 LoRa (Long Range) is a spread spectrum modulation technique derived from chirp spread spectrum (CSS) technology. 👉 Semtech’s LoRa devices and wireless radio frequency technology (LoRa Technology) is a long range, low power wireless platform that has become the de facto technology for Internet of Things (IoT) networks worldwide. 👉 LoRa Technology enables smart IoT applications that solve some of the biggest challenges facing our planet: energy management, natural resource reduction, pollution control, infrastructure efficiency, disaster prevention, and more.  👉 With over 50 million devices connected to networks in 95 countries and growing, LoRa Technology is the DNA of IoT, creating a Smarter Planet.

Hearing LoRa everywhere??? Even me.. Thought to have a sneak peek into it.. Here it is...

If anyone interested in doing this project, pls write to us to the mail id in pinned message. Wil provide u with more details..

First we need to define the pins to which the sensor is connected and define a variable for reading the frequency. We need to define the four control pins as outputs and the sensor output as an Arduino input. Here we also need to set the frequency-scaling, for this example set it to 20%, and start the serial communication for displaying the results in the Serial Monitor.

Let's move on and connect the TCS230 sensor to the Arduino board. Here’s the circuit schematics.

The sensor has two more control pins, S0 and S1 which are used for scaling the output frequency. The frequency can be scaled to three different preset values of 100 %, 20 % or 2%. This frequency-scaling function allows the output of the sensor to be optimized for various frequency counters or microcontrollers.

Each 16 photodiodes are connected in parallel, so using the two control pins S2 and S3 we can select which of them will be read. So for example, if we want to detect red color, we can just use the 16 red filtered photodiodes by setting the two pins to low logic level according to the table.

If we take a closer look at the sensor we can see how it detects various colors. The photodiodes have three different color filters. Sixteen of them have red filters, another 16 have green filters, another 16 have blue filters and the other 16 photodiodes are clear with no filters.

How TCS230 Color Sensor Works The TCS230 senses color light with the help of an 8 x 8 array of photodiodes. Then using a Current-to-Frequency Converter the readings from the photodiodes are converted into a square wave with a frequency directly proportional to the light intensity. Finally, using the Arduino Board we can read the square wave output and get the results for the color.