TAHMO SENSOR COMPETITION 2014 DESIGN OF A SUNSHINE- HOUR SENSOR. The team. Ladipo Kehinde.O, MET Dept.
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1 TAHMO SENSOR COMPETITION 04 DESIGN OF A SUNSHINE- HOUR SENSOR The team Ladipo Kehinde.O, (dehinke03@gmail.com, MET Dept. FUTA) Prof.Adeyewa, adeyewa@yahoo.com, vc@run.edu.ng
2 DESIGN OF A SUNSHINE- HOUR SENSOR A Sunshine hour sensor was designed. The design is based on **Simichieu (985), that the minimum threshold value of solar intensity which will start a record in a Campbell stoke sunshine recorder is within the limits of 70 to 300W/m.The design comprises of a glass sphere painted black for maximum absorber of radiation. A light dependent resistor () is used as the sunshine hour sensor because operates at a visible range of wavelength 390 to 750nm.The is covered with the black glass sphere. The output of the sensor is connected to Analog to digital converter (ADC) to convert from analog voltage to four bits digital pulses. The four bits digital outputs is compared with a fixed four bits digital value corresponding to the 70 to 300W/m of radiation needed to burn the Campbell stokes sunshine card. Both signals is fed to the comparator inputs of a digital comparator (CD7485).The output of the digital comparator is then synchronized with a one minute clock with a digital integrated circuit (AND gate).the pulse output is then connected to a frequency counter. This is then calibrated against a Campbell stokes sunshine hour recorder.figure shows the electronics circuit diagram. Figure,3 and 4 also shows the printed circuits diagram while figure 5a and 5b, the physical diagram of the design. The design will be made of Aluminum case for ruggedness. Bill Of Materials For SUNSHINE HOUR SENSOR DESIGN.DSN Design Title : SUNSHINE HOUR SENSOR DESIGN.DSN Author : LADIPO K..O Revision : <NONE> Design Created : Tuesday, March, 03 Design Last Modified : Thursday, JUNE 30, 04 Total Parts In Design : 54 3 Resistors R, R9 k R, R3 M R4 M 4 R5, R6, R, R 0R R7 4.7K R8, R0 6.8M
3 R 330K 5 Capacitors C 0u C, C3 n5 C, C4 33pF 7 Integrated Circuits U ADC0804 U U3 74LS85 U4 74LS04 U5 74HC08 U6 407 U Transistors Q TIP4 5 Diodes D N4734A D LED-RED D3 LOW BATT LED-YELLOW D4 N400 D4 BATT LED-GREEN 3 Miscellaneous BAT 9V 4-way cable mnt skt recptcl.series, 5m -core screen cable.
4 4 J, J4-J7, J-J4, J-J4, J3, J33 SIL RV, RV0 M X 3.768KHz CR Thursday ** Simichieu O.A (985) Compendium of Lecture Note on Meteorological Instruments for training Class iii and iv Met Personnel, Volume.pp46-47.
5 9V Battery /9v DC Power regulator circuit Q TIP4 VSS R9 k J7.0 J6 R7 4.7K D LED-RED J33 FREQUENCY COUNTER J SIL-00-0 C D4 N400 RV R4 M M R SIL-00-0 SIL-00-0 k C J n5.0 SIL-00-0 D SUNSHINE SENSOR CIRCUIT N4734A J u RV0 SIL-00-0 J3 J4.0 4 M SIL-00-0 SIL-00-0 GND R R3 M M U:A U:B U:C U:E R5 R6 0R 0R C3 n5 J4 J5 D4 BATT LED-RED SIL-00-0 SIL-00-0 BATTERY VOLTAGE INDICATOR CIRCUIT U CS RD 3 WR 4 CLK IN 5 INTR 8 A GND 0 D GND 9 VREF/ 9 CLK R 6 VIN+ 7 VIN- ADC0804 D3 LOW BATT LED-RED VCC DB0(LSB) DB DB DB3 DB4 DB5 DB6 DB7(MSB) J SIL-00-0 J SIL-00-0 J3 SIL-00-0 J4 SIL-00-0 U3 0 A0 A 3 A 5 A3 9 B0 B 4 B B3 7 A<B QA<B 3 6 A=B QA=B 4 5 A>B QA>B 74LS85 U4:A 74LS04 SIL-00-0 CLK CE RST Sunshine pulses U5:A Timing pulses,hz (t=min) 74HC08 R 0R 0R CR U4:B n 74LS04 X CRYSTAL 3 SUNSHINEHOUR SENSOR ELECTRONICS BOARD 30303S00 DESIGNED BY LADIPO K.O (dehinke@yahoo.co.uk) Figure, the electronics diagram of the Sunshine sensor Figure, the printed circuit diagram of the Sunshine hour sensor
6 Figure3 and 4, the PCB layout without components, front and back
7 Black Glass sphere Light Dependent Resistors () printed circuit board. Aluminium Housing ` Main sunshinehour sensor board Base Aluminium Housing Figure5b Aluminium cover Figure5a Figure 5a and 5b, Physical features of the Sunshine hour sensor
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