Single-Board-Heater-System/C2/Introduction-to-Single-Board-Heater-System/English-timed
From Script | Spoken-Tutorial
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| 00:01 | Welcome to the spoken tutorial on “Introduction to Single Board Heater System”. |
| 00:06 | In this tutorial, we will see the salient features of SBHS, |
| 00:11 | block diagram explanation of SBHS. |
| 00:14 | The Single-board Heater System is abbreviated as SBHS. |
| 00:19 | It is a micro-controller based lab-in-a-box temperature control setup. |
| 00:24 | The setup has been designed to cater to the needs of undergraduate & postgraduate control courses. |
| 00:32 | It revolves around the concepts of electronics |
| 00:36 | Serial port communication |
| 00:38 | Micro-controller programming |
| 00:40 | Data acquisition interface |
| 00:42 | Control theory. |
| 00:44 | These concepts serve as the basic foundation for its development. |
| 00:50 | Next we shall talk about the salient features of SBHS. |
| 00:55 | SBHS is a 3000 rupee device with its hardware design and codes released as open source. |
| 01:03 | However, please note that the actual price during purchase may vary. |
| 01:08 | An open source software is used to interface SBHS. |
| 01:12 | More details can be sought from: sbhs dot os hyphen hardware dot in. |
| 01:19 | Moreover, it has a small time constant of around 1 minute. |
| 01:24 | Hence, one can do realistic experiment in 10 minutes. |
| 01:29 | This setup is also available for remote access under Virtual labs project. |
| 01:35 | One can access it remotely and get a feel for it. |
| 01:38 | Later, the user can buy it or assemble it and set it up as a lab at a college or at home. |
| 01:46 | Figure shows the picture of Single Board Heater System. |
| 01:50 | It has an SMPS to generate 12 Volt regulated DC power supply, |
| 01:56 | a metal blade and a heater coil is situated below this metal support, |
| 02:02 | a computer fan, a display, |
| 02:04 | USB and RS232 ports. |
| 02:08 | We would now see the block diagram of SBHS. |
| 02:11 | The figure shows the block diagram of SBHS. |
| 02:14 | It consists of power supply, |
| 02:17 | 8-bit micro-controller, |
| 02:19 | display, fan, |
| 02:21 | Heater Assembly, temperature sensor, |
| 02:25 | instrumentation amplifier and associated circuitry, |
| 02:29 | ISP, serial and USB ports. |
| 02:33 | We would now see a brief explanation of the various blocks in SBHS. |
| 02:39 | First, we will see the power Supply. |
| 02:42 | The power supply is basically a 12V 400 watt SMPS. |
| 02:47 | This 12V supply is used directly but most of the circuitry requires 5V supply. |
| 02:54 | Hence, separate voltage regulators are used wherever necessary. |
| 02:59 | Also, to avoid any ambiguous temperature readings due to power supply fluctuations, the voltage regulators for systems and sensors are kept separate. |
| 03:09 | Next is Micro-controller. |
| 03:11 | An 8-bit ATmega16 micro-controller is used. |
| 03:15 | Micro-controller plays a very important role. |
| 03:19 | It controls every single hardware present on the SBHS, directly or indirectly. |
| 03:25 | It executes various tasks like setting up communication between computer and SBHS |
| 03:33 | controlling the amount of current passing through the heater coil |
| 03:37 | controlling fan speed |
| 03:39 | reading the temperature value |
| 03:42 | displaying parameter values and various other necessary operations. |
| 03:47 | Next comes the heater and fan. |
| 03:50 | The heater assembly consist of a metal plate placed about 3.5 mm away from a nichrome wire coil. |
| 03:58 | When current passes through the coil, the coil gets heated. |
| 04:02 | This heat is transferred to the metal plate through convection, increasing its temperature. |
| 04:08 | The fan used is a small regular computer fan. |
| 04:12 | It is used for cooling the heated metal plate. |
| 04:15 | Due to some tried and tested reasons, it is placed below the heater. |
| 04:20 | Next comes the Driver block. |
| 04:23 | This is nothing but a device which varies the amount of power delivered to the fan and heater. |
| 04:29 | MOSFETS are used for the same. |
| 04:32 | MOSFETS are operated as per the commands given by the micro-controller. |
| 04:37 | These MOSFETS are actually switched at some PWM frequency. |
| 04:42 | Now we will talk about the Temperature sensor. |
| 04:45 | AD590 is the Temperature sensor used for sensing the temperature of the heated plate. |
| 04:51 | The output of this sensor is in micro ampere per kelvin. |
| 04:56 | The operating temperature ranges from -55 to 150 degree Celsius. |
| 05:02 | Moreover, it does not require any further process of linearization. |
| 05:07 | Next we will see Instrumentation amplifier. |
| 05:11 | Instrumentation amplifier is used for signal conditioning of the signal generated by AD590. |
| 05:18 | It also provides good input impedance for the temperature sensor. |
| 05:23 | Hence, the signal generated by the sensor is not attenuated during signal conditioning. |
| 05:30 | The Display and Indicators block. |
| 05:33 | Display constitutes of a 16x2 LCD display. |
| 05:37 | This means that the display is capable of displaying two lines of 16 characters each. |
| 05:44 | No separate controller is required since it has its own in-built controller. |
| 05:50 | It is used for displaying various parameters like temperature, fan, heater and machine ID (MID) . |
| 05:56 | It is operated in 4-bit mode. |
| 05:59 | Indicators include various on-board LEDs. |
| 06:04 | Next we have Serial Voltage Level Converter block. |
| 06:09 | It is used for conversion of signals from serial to TTL and vice versa. |
| 06:15 | Next we have USB to Serial Converter block. |
| 06:19 | It is used for conversion of signals from USB to serial and vice versa. |
| 06:24 | Next we have USB and RS232 blocks. |
| 06:28 | It is used to connect the USB and RS232 cable. |
| 06:33 | Last we have the ISP block. |
| 06:36 | ISP stands for "In-System Programming". |
| 06:39 | It is actually a 10 pin male connector. |
| 06:42 | Through this, we can program the micro-controller with the help of proper programming device. |
| 06:48 | This brings us to the end of this spoken tutorial on Introduction to Single Board Heater System. |
| 06:54 | Let us summarize. |
| 06:56 | In this spoken tutorial, we saw the salient features and block diagram explanation of SBHS. |
| 07:03 | The various blocks briefly explained include: Power Supply, |
| 07:07 | micro-controller, heater and fan, |
| 07:09 | driver, temperature sensor, |
| 07:11 | instrumentation amplifier, display, |
| 07:14 | USB & RS232 ports, ISP. |
| 07:19 | Watch the video available at the following link. |
| 07:22 | It summarizes the Spoken Tutorial project. |
| 07:25 | If you do not have good bandwidth, you can download and watch it. |
| 07:29 | The Spoken Tutorial project team: Conducts workshops using spoken tutorials. |
| 07:34 | Gives certificates to those who pass an online test. |
| 07:38 | For more details, please write to contact@spoken-tutorial.org. |
| 07:45 | Spoken Tutorial project is a part of the Talk to a Teacher project. |
| 07:49 | It is supported by the National Mission on Education through ICT, MHRD, Government of India. |
| 07:56 | More information on this mission is available at:
[1]. |
| 08:08 | This is Rupak Rokade from IIT Bombay, signing off. |
