pics of electronics design group assigment

docs/assignments/week06/electronics-design.md

 #Week 6 Electronics Design - Group Assignment
 
-![Oscope]()
+![Oscope](../assignments/week06/images/oscope.jpeg)
 
-![DVM()]
+![DVM](../assignments/week06/images/digital-volt-meter.jpeg)
 
-The purpose of this week's group assigment is to become familiar with the test equipment in our lab.  Josep told us that we have a pocket oscilloscope and a voltmeter.
+The purpose of this week's group assignment is to become familiar with the test equipment in our lab.  Josep told us that we have a pocket oscilloscope and a voltmeter.
 
-We used the digital volt meter (DVM) and pocket oscilloscope to read some some votages on the SMD11c board that Marco built.  We changed the blink rate on the LED by editing the sketch in the Arduino IDE and observed the voltage across the LED.
+We used the digital volt meter (DVM) and pocket oscilloscope to read some some voltages on the SMD11c board that Marco built.  We changed the blink rate on the LED by editing the sketch in the Arduino IDE and observed the voltage across the LED.
 
-![o-scope]()
+![o-scope back](../assignments/week06/images/oscope-back.jpeg)
 
 We used a pocket oscilloscope called DSO Nano v3, which is was an open source project sold by SEEED.  It is no longer manufactured or supported by teh manufatcturer, but there is a community taht cintnues to make modufcations on the product.
 
-![DVM]()
+![DVM](../assignments/week06/images/digital-volt-meter.jpeg)
 
 The digital volt meter (DVM) is made a NIMO electronics MY63 MUL003 meter.
 
 ##Digital Volt Meter
 
 
-![DVM voltage on regulator]()
+![DVM voltage on regulator](docs/assignments/week06/images/dvm-on-led.jpeg)
 
-We measured the voltage in and out of the regulator.  We noticed that the voltage on the output of the reulator dipped when the LED came on.
+We measured the voltage in and out of the regulator.  We noticed that the 3.2 volts on the output of the regulator dipped when the LED came on.
 
 The voltage into the regulator was a steady 5 volts.
 
 
-
-
 ![Video of voltage across LED]()
 
-Next we looked at the voltage across the LED and the LED and resistor.  The program turned the LED on for one second and off for two secnds.
+Next we looked at the voltage across the LED and the LED and resistor.  The program turned the LED on for one second and off for two seconds.
 
 ![Video of DVM across LED various parameters]()
 
-We calculated what the votage should be across the resistor (Vdd-Vled=Vr) and then measured it to confirm.   The voltage was within a few hundredths of a volt of what we calculated.
+We calculated what the voltage should be across the resistor (Vdd-Vled=Vr) and then measured it to confirm.   The voltage was within a few hundredths of a volt of what we calculated.
 
 
 ##Pocket oscilloscope
 
-![Video of Oscope]()
+![Video of Oscope](./docs/assignments/week06/images/oscope-back.jpeg)
 
-   We used the pocket oscilloscope to observe the voltage across the LED as we changed the parameters of the light blinking Arduino IDE sketch.  The key to being able to observe the trace on the oscilloscope is setting the voltage and time scales to the right values for the signal we want to observe.   The pocket oscope can only go up to about 200 khz, plenty for what we were loking at.
+![Front of oscilloscope](../week06/images/oscope.jpeg)
 
-![One Second on 2 off]()
 
-One second on 2 seconds off
+An oscilloscope allows you to see an electrical signal.   It shows a graph of the signal - the x axis of the graph is voltage and the y axis is time.  You need to set appropriate voltage and time scales in order to see the voltage on the screen.    
 
-![Another Oscope Video]()
+We used the pocket oscilloscope to observe the voltage across the LED as we changed the parameters of the light blinking Arduino IDE sketch.  The key to being able to observe the trace on the oscilloscope is setting the voltage and time scales to the right values for the signal we want to observe.   The pocket oscope can only go up to about 200 khz, plenty of bamdwidth for what we were looking at.
 
+![One Second on 2 off](docs/assignments/week06/images/image 2.jpg)
+
+One second on 2 seconds off
 
-![Yet Another Oscope Video]()
 
-!Even one more Oscope Video]()
 
 
 ##Reflections and Conclusions
 
-It seems like it would be pretty easy to short things out using the leads on the voltmeter and oscilloscope, althought we didn't.  Checked the data sheet on the LM 3480 and it is short circuit protected.  USB is also short circuit protected.
+It seems like it would be pretty easy to short things out using the leads on the voltmeter and oscilloscope, although we didn't.  Checked the data sheet on the LM 3480 and it is short circuit protected.  USB is also short circuit protected.
+
+We didn't try to measure currents because you need to break the circuit and insert the meter into the circuit.  It is not easy to break into a pcb trace to measure current.   This is one disadvantage with PCBs over proto boards. You could design PCB boards that would allow current measurements.  We could build a board with jacks for pins to read current - shorted in normal use but routed through a voltmeter when you want to read current.     
 
-We didnt try to measure currents.  It was surprising to see the output voltge of the regulator dip when the LED came on.   The LED is only a load of about 20 ma, and the regulator is rated at 100 ma.  We could build a board with jacks for pins to read current - shorted in normal use but routed through a voltmeter when you want to read current.   I wonder what the actual current draw of the SAMD11C is.  Looks like the SAMD11C has a minimum amp load of 8 microamps to about 1 ma when on.
+It was surprising to see the output voltge of the regulator dip when the LED came on.   The LED is only a load of about 20 ma, and the regulator is rated at 100 ma.     I wonder what the actual current draw of the SAMD11C is.  Looks like the SAMD11C has a minimum amp load of 8 microamps to about 1 ma when on.

docs/assignments/week06/images/video 1

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