Volt Regulator
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100A 0-240VAC SSR Solid State Relay Volt Resistance Regulator SSR-100VA $33.15 |
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100A 0-240VAC SSR Solid State Relay Volt Resistance Regulator SSR-100VA $33.00 |
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100A 0-240VAC SSR Solid State Relay Volt Resistance Regulator SSR-100VA $32.71 |
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100A 0-240VAC SSR Solid State Relay Volt Resistance Regulator SSR-100VA $32.55 |
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Goldsource DF1790-1303 DC Regulated 12 / 13.8V 13.8 V Volt Power Supply 3 Amp $27.99 |
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HP 5340A FREQUENCY COUNTER +15 VOLT REGULATOR MODULE 05340-60025 (2-1-5-115) $19.99 |
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DC DC Converter Regulator 24Volt down to 12V 20A 240W $17.99 |
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10 ~ LM309KC – 5 Volt Regulators / Transistors + 5 More $24.00 |
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Solid State Relay Volt Resistance Regulator 100A 380VAC $0.69 |
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Solid State Relay Volt Resistance Regulator 100A 380VAC $27.69 |
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LAS3905K – Positive Voltage Regulator – 5 Volt – 8 Amp / Lambda Linear Regulator $25.00 |
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HP 5340A 18GHZ FREQUENCY COUNTER +5VOLT REGULATOR MODULE 05340-60023 (2-1-5-70) $19.99 |
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HP 5340A 18GHZ FREQUENCY COUNTER -5VOLT REGULATOR MODULE 05340-60024 (2-1-5-71) $19.99 |
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Power Supply/Adapter, Regulated, 120vac to 5v/vdc/volts, 1a/amp, wall-mount $17.44 |
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100 pcs LM317T LM317 Volt Regulator 1.2V to 37V 1.5A $25.99 |
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100 pcs LM317T LM317 Volt Regulator 1.2V to 37V 1.5A $25.99 |
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80A 0-240VAC SSR Solid State Relay Volt Resistance Regulator SSR-80VA $24.80 |
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100,LM317T LM317 Volt Regulator 1.2V to 37V 1.5A NEW m $24.60 |
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LAS16U LAMDA IC VOLT REGULATOR ADJUSTABLE BIPOLAR TRANSISTOR $17.00 |
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NS LM323K STEEL 3-Amp 5-Volt Positive Regulator TO-3 $18.75 |
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80A 0-240VAC SSR Solid State Relay Volt Resistance Regulator SSR-80VA $23.60 |
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80A 0-240VAC SSR Solid State Relay Volt Resistance Regulator SSR-80VA $23.60 |
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80A 0-240VAC SSR Solid State Relay Volt Resistance Regulator SSR-80VA $23.29 |
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80A 0-240VAC SSR Solid State Relay Volt Resistance Regulator SSR-80VA $23.27 |
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80A 0-240VAC SSR Solid State Relay Volt Resistance Regulator SSR-80VA $23.23 |
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80A 0-240VAC SSR Solid State Relay Volt Resistance Regulator SSR-80VA $23.21 |
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80A 0-240VAC SSR Solid State Relay Volt Resistance Regulator SSR-80VA $23.01 |
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MOTOROLA MC78T15 3AMP VOLT. REGULATORS 7815 (50 PCS) $19.00 |
Volt Regulator Questions
Anti -Nap (student electronic pen)
First as we mentioned before in the previous parts of this report, the main objective of this report was accomplished.
This success was reached by several steps and new ideas.
Briefly as an introduction to this part we are going to discuss how we managed to solve the several problems that we faced during our work. Then to talk about the main idea used to acquire the input data which is either the student has felt asleep or not. Third we will talk about how this input data is analyzed and transformed into an output data.
Choosing the Parts:
As we have seen before this project was about preventing students in their classes to fall asleep, this aim practically was attained by choosing parts that will fit and give the required results.
In order to create a circuit that fits inside a normal pen it was some how a difficult task, also with this poor elements in our hands it was impossible to create an SMD circuit in other words a surface mounted circuit in which electronic circuits are constructed in small sizes on the surface of the board. This was the only method in order to fit our circuit into a pen.
So we started to search about ready boards in the market which some how completes the needed tasks. After our search we have found a circuit which is used in an RF remote control circuit:
The parts used in this circuit are commonly used in many domains and are easily affordable, also it transmits data at a considerable range, finally it has four output selections each has a certain code. Hence this circuit was a good and acceptable choice.
The second task was to choose the parts of the receiver circuit which should be compatible with the transmitter circuit. Hence we choose the same family receiver RX of receiving frequency 433,92 MHz. Then also the decoder have been chosen from the same family HT 12 D. Besides that we connected a normal DC motor in order to vibrate the receiver module.
The third and final task was to choose the parts to complete the teacher receiver module with an LCD. The same parts are used in this circuit which are the HT12D and the RX and besides that we used a PIC to control the LCD.
The Transmitter
A. The parts used are:
- The Radio Frequency Transmitter: it is a digital transmitter that works at frequency 433,92 MHz.
- The HT 12 E encoder.
- The ball Switch.
First as we mentioned before in the previous parts of this report, the main objective of this report was accomplished.
This success was reached by several steps and new ideas.
Briefly as an introduction to this part we are going to discuss how we managed to solve the several problems that we faced during our work. Then to talk about the main idea used to acquire the input data which is either the student has felt asleep or not. Third we will talk about how this input data is analyzed and transformed into an output data.
Choosing the Parts:
As we have seen before this project was about preventing students in their classes to fall asleep, this aim practically was attained by choosing parts that will fit and give the required results.
In order to create a circuit that fits inside a normal pen it was some how a difficult task, also with this poor elements in our hands it was impossible to create an SMD circuit in other words a surface mounted circuit in which electronic circuits are constructed in small sizes on the surface of the board. This was the only method in order to fit our circuit into a pen.
So we started to search about ready boards in the market which some how completes the needed tasks. After our search we have found a circuit which is used in an RF remote control circuit:
The parts used in this circuit are commonly used in many domains and are easily affordable, also it transmits data at a considerable range, finally it has four output selections each has a certain code. Hence this circuit was a good and acceptable choice.
The second task was to choose the parts of the receiver circuit which should be compatible with the transmitter circuit. Hence we choose the same family receiver RX of receiving frequency 433,92 MHz. Then also the decoder have been chosen from the same family HT 12 D. Besides that we connected a normal DC motor in order to vibrate the receiver module. The third and final task was to choose the parts to complete the teacher receiver module with an LCD. The same parts are used in this circuit which are the HT12D and the RX and besides that we used a PIC to control the LCD.
The Transmitter
A. The parts used are:
- The Radio Frequency Transmitter: it is a digital transmitter that works at frequency 433,92 MHz.
- The HT 12 E encoder.
- The ball Switch.
B. The circuit block diagram.
C. The circuit works in the following manner.
First the input data enters by four switches sw1 to sw4 we used these switches each for one pen device. Second, these input data enters the encoder which will code the data to be sent in a wireless technique. Finally the output of the encoder will be sent by the transmitter at a frequency of 433,92 MHz frequency.
We intended to assign each switch to a certain pen device, hence each pen will use one port of the HT 12 D and HT 12 E ICs .
In order then to determine whether this student has felt asleep w suggested several methods and finally we have chosen the used one. A student if not sleeping then he holds the pen in a vertical way in this case no data should be sent. And when he sleeps the pen is left and then it is in a horizontal direction and it should send data. And according to this suggestion we used a ball switch which is activated according to the position of the ball inside a small tube. This was the best way to be used with fewer errors. The second way which was eliminated from our search due to certain errors is using a transistor as a switch which will close due to the hand resistance when the pen is held by the student. We thought that we could attach to the pen aluminum strips which are connected to the base of a transistor.
The main problem was that these strips are under the effect of moisture and wastes which could be the resistance to close the switch, hence this way was eliminated.
D. The electronic diagram:
Transmitter electronic representation.
The above circuit is the SMD circuit used and fitted inside the pen indeed an on/off switch button was used accompanied with a led.
And as mentioned a ball switch was used and placed in a way that when the pen is horizontal the switch is closed and then the encoder codes the signal and the TX sends it.
The Student Receiver circuit:
A. The parts used:
- The Rx receiver .
- The HT 12 D decoder.
- The nine volt battery.
- The DC motor vibrator.
B. The circuit block diagram:
student receiver block diagam.
C. The circuit works in the following manner:
First the receiver receives the signal if sent; second the data are processed by the decoder. As we mentioned each pen device uses one port in the decoder and coder.Hence if data is sent the decoder decodes the signal and triggers the motor to vibrate till the transmission stops.
D. The electronic diagram:
Student receiver electronic representation.
The above circuit is the circuit we realized manually where we used compatible components with that used in the SMD transmitting circuit.
When a pen transmits a signal, the receiver receives it and then the decoder analyzes the signal and triggers hence the motor which is connected to a normally close relay.
E. The PCB diagram:
After we created the electronic representation of the receiving module the following image shows the PCB representation.This circuit takes voltage from a normal DC 9 volts battery, and off course capacitors are used as filters. After the signal is filtered a voltage regulator converts to give 5 volts voltage; this voltage is used to operate the receiver RX. But the remaining parts operate at the 9 volts from the battery.This PCB representation has the dimensions: 51.1 mm by 44.9 mm.
These dimensions shows how we managed to design a somehow compact module to be placed in side a plastic cover with indeed several options:
* An on/off switch. * An on/off led * A removable 9 volts battery
* A design that can be fixed on the student’s belt
The teacher receiver circuit:
A. The parts used:
- The Rx receiver .
- The HT 12 D decoder.
- The nine volt battery.
- The 12*2 lines LCD.
- The PIC 16f877 microcontroller.
B. The circuit block diagram:
the teacher receiver block diagram
C. The circuit works in the following manner:
First the receiver receives the signal if sent; second the data are processed by the decoder. As we mentioned each pen device uses one port in the decoder and coder.
Hence if data is sent the decoder decodes the signal and sends it to the, main processing part in this circuit; the PIC. Here the PIC processes the signal which is operated by a program realized by us using the Proton + language.
After realizing the data entered to the PIC the LCD shows which student has felt asleep.
C. The electronic diagram:
Teacher receiver electronic representation.
The above circuit was realized also manually where we used also compatible parts to the transmitting circuit. Besides as we mentioned the central processing unit in this circuit is the PIC 16f877.
Indeed the capacitors are used as filters to the signal, also a five volts regulator is used to supply the circuit. Besides the PIC is triggered by an external oscillator. The port b of the PIC was connected to the LCD and the port d is that connected to the decoder which takes the signal from the receiver.
As mentioned before the programming language is done by using the proton + language.
D. The programming language: DEVICE 16F877
XTAL 10
PRINT $FE,$0E
PRINT $FE,$0F
DECLARE LCD_DTPIN PORTC.4
DECLARE LCD_RSPIN PORTB.1
DECLARE LCD_ENPIN PORTB.2
while 1
if portd.4 <> 0 then
print “student 1 is sleeping”
endif
if portd.5 <> 0 then
print “student 2 is sleeping”
endif
if portd.6 <> 0 then
print “student 3 is sleeping”
endif
if portd.7 <> 0 then
print “student 4 is sleeping”
endif
wend
About the Author
Eng. Kassem Danach
CCE – IT coordinator at Islamic University Of Lebanon
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