Basics on Tools, Power, and Communication Prof. Rohan Munasinghe Department of Electronic and Telecommunication Engineering Faculty of Engineering University of Moratuwa 10400 Electronic Tools 50W soldering station PCB Holder Third Hand (for soldering) 60% Sn (Tin), 40% Pb (Lead), rosin-core solder (wash your hands after soldering) Desoldering sucker Electronic Tools Tip Tinner (removes oxide) Wire cutter Twizeer Wire stripper Power Supplies • AC to DC conversion
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Basics on Tools, Power, and
Communication
Prof. Rohan MunasingheDepartment of Electronic and Telecommunication EngineeringFaculty of Engineering
University of Moratuwa 10400
Electronic Tools
50W soldering station PCB Holder Third Hand (for soldering)
60% Sn (Tin), 40% Pb (Lead), rosin-core solder (wash your hands after soldering) Desoldering sucker
Electronic Tools
Tip Tinner(removes oxide)
Wire cutter
Twizeer Wire stripper
Power Supplies
• AC to DC conversion
Power Supplies• Voltage Regulation using Zener Diode
• Voltage Regulation Using Regulator IC For a stabile
transient
responseresponse
Reduce ripple
• Using unregulated power adapters
Power Supply
LiPo Batteries
• Voltage and Capacity
• One cell = 3.7V / 2200mHh
– 2S: two series cells (7.4V / 2200mHh)
– 3S: three series cells (11.1V/2200mAh).– 3S: three series cells (11.1V/2200mAh).
• 2P means that there are two groups of cells wired in parallel
to increase capacity without increasing voltage.
– 3S2P: two parallel packs of three cells (11.1V/4400mAh).
LiPo Batteries• Current Rating (C rating) : Example 2200mAh battery with
25C continuous, 35C "climb outs" and 50C max bursts.
– 25C pack would be 25 x 2200/1000 = 50 Amps (continuous).
– This battery can supply 50Amps continuously, 77Amps for a short period and a max short burst of 110Amps.period and a max short burst of 110Amps.
• Special balance Charger to be used.
• Store LiPo in a “LiPo safe” bag (recommended).
Wire ties and connectors• Firm electrical connections
– No hand wound connections
– No open battery terminal wires
(use insulated sockets)
• Tie up wires to mobile platform
neatly using wire ties. Bundle
them whenever possible
Digital Communication• UART : Universal Asynchronous Receiver Transmitter
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Serial transmission
Device 1 Device 2
1 byte 1 byte
UART
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UART
RS-232
RS-422
RS-485
etc
RS-232
RS-422
RS-485
etc
Serial transmission
etc etc
RS232 Serial Standard
• Pinout
1. DCD-data carrier detect
2. Receive Data
3. Transmit data
4. Data terminal ready
5. GND
6. Data set ready
7. Request to send
8. Clear to send
9. Ring indicator
RS232 Data Format
• Data rate, parity (optional), number of stop bits are configurable
-12-5
• Non return to Zero Level (NRTZL) line encoding
-5
+5+12
USB Interface
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Device complies with USB standards
De
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dd
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sE
nd
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mb
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USB driver passed Windows Hardware Quality Labs Test