diff --git a/docs/Electronics Design.md b/docs/Electronics Design.md
index 20793d86b247777fd30f65f55e650fb8d81cb19e..1bf7910a9293d1f7e460fdd65654be1da5b43603 100644
--- a/docs/Electronics Design.md
+++ b/docs/Electronics Design.md
@@ -18,49 +18,66 @@ A multimeter is a handy piece of equipment used for measuring voltage, current,
#### Operating voltage, resistance and continuity on the board with *multimeter*
-To measure Voltage:
+**To measure Voltage:**
Plug the black and the red probe into corresponding ports (depending on the model of multimeter).
Set the knob of multimeter to *V*.
Touch the black probe to the GND pin and the red probe to the VCC pin of the board.
The screen will display the voltage across GND and VCC.
-To measure Resistance:
+**To measure Resistance:**
Set the knob of multimeter to *R* or Ohm symbol. Use *range* button to select M ohm, Kilo Ohm or Ohm.
Touch the black and red probes to the two ends of any resistor on the board or the corresponding traces.
-To measure Current:
+**To measure Current:**
Current measurement for electronic circuit board is not very common, especially for surface mount circuit boards. To measure current, the flow of current must be physically interrupted and the multimeter must be connected in-line. This can be done by adding a jumper bridge in the design of the board.
Then by connecting the two probes of the multimeter in-line to the two jumper pads on the *mA* setting.
-To check Continuity:
+**To check Continuity:**
Continuity testing measures the resistance between two points. If the resistance is very low, there is a beep which means the two points are in continuity. If resistance is high, the circuit is open, and the multimeter won't beep.
-This is the most useful to check connections and solder joints between microcontroller pins and header pins to connect inputs or outputs.
+This is the most useful to check connections and solder joints between microcontroller pins and header pins to connect inputs or outputs.
Set the multimeter to 'Continuity' - a diode symbol with propagation waves around it.
Touch the two probes on the two points to be checked and beep will give the feedback.
+<iframe width="688" height="387" src="https://youtu.be/6juAN_C_nUE" frameborder="0" allow="accelerometer; autoplay;
+ encrypted-media; gyroscope; picture-in-picture" allowfullscreen=""></iframe>
+
+
#### Use *oscilloscope* to check noise of operating voltage
-An oscilloscope, o=scope or scope is useful to measure amplitude, frequency or transient signals that a multimeter cannot catch. It samples a signal and displays the waveform on a screen. Both digital squarewaves and analog curved waves.
-
-Parts of the ocilloscope interface.
-1. The screen on the left displays the waveforms.
-2. The channel ports. This one has 2.
-3. The vertical sections controls the voltage scale on the display for each channel independantly.
-4. The horizontal section controls the timescale for both channels.
-5. The third section is to trigger specific controls of the scope.
-6. The menu section has various settings, like capturing an image for eg.
-7. Buttons to start and stop measuring.
-8. Passive voltage scope to measure voltage across the probe ends.
+An oscilloscope, o-scope or scope is useful to measure amplitude, frequency or transient signals that a multimeter cannot catch. It samples a signal and displays the waveform on a screen. Both digital squarewaves and analog curved waves.
+
+Parts of the ocilloscope interface:
+1. The screen on the left displays the waveforms.
+2. The channel ports. This one has 2.
+3. The vertical sections controls the voltage scale on the display for each channel independently.
+4. The horizontal section controls the timescale for both channels.
+5. The third section is to trigger specific controls of the scope.
+6. The menu section has various settings, like capturing an image for eg.
+7. Buttons to start and stop measuring.
+8. Passive voltage scope to measure voltage across the probe ends.
-This tutorial on [How to use a oscilloscope](https://learn.sparkfun.com/tutorials/how-to-use-an-oscilloscope/all) is helpful.
-
+This tutorial on [How to use a oscilloscope](https://learn.sparkfun.com/tutorials/how-to-use-an-oscilloscope/all) is very helpful.
+
+As described I first make these adjustments to put the scope into a standard setup:
+1. Turn channel 1 on and channel 2 off.
+2. Set channel 1 to DC coupling.
+3. Set the trigger source to channel 1 -- no external source or alternate channel triggering.
+4. Set the trigger type to rising edge, and the trigger mode to auto (as opposed to single).
+5. Make sure the scope probe attenuation on the scope matches the setting on the probe (e.g. 1X, 10X).
+
-#### Interpret a data signal using a *logic analyser*
-[Introduction](https://www.baldengineer.com/logic-analyzer-tutorial-introduction.html)
+Next, I first tried to test the probe. The scopes has a built-in frequency generator that emits a reliable, set-frequency wave - there is a 1kHz square wave output at the bottom-centre of the interface. The frequency generator output has two separate conductors -- one for the signal and one for ground. I connected the probe's ground clip to the ground, and the probe tip to the signal output.
+
+As soon as I connect both parts of the probe, I see a signal begin to dance around the screen. I fiddle with the horizontal and vertical system knobs to scale and position the waveform on the screen with a visible zoom level.
+I adjusted the screw on the probe handle until I have a straight-edged square wave.
+
+
+Finally, I used an Arduino Uno with a blink program on external LED to check output signals. By connecting the probe to GND and output pins, and adjusting the visible waveforms, horizontal and vertical scale and position, I found a dancing waveform like in the picture:
+
If this equipment is not available, another way to test microcontroller circuit boards is by making a simulation in web-apps like [TinkerCAD](https://www.tinkercad.com/) or the open-source Arduino simulator, [Wokwi](https://wokwi.com/).
@@ -91,7 +108,7 @@ Added components:
[Data sheet for ATtiny44](http://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-7701_Automotive-Microcontrollers-ATtiny24-44-84_Datasheet.pdf) - You can find an explanation in the [Embedded Programming week](./Embedded Programming.md).
-Pinout for Attiny44
+Pinout for Attiny44:
@@ -175,6 +192,32 @@ But this time I used [Mods](http://mods.cba.mit.edu/) instead of Fabmodules. Her
+#### Designing in Eagle
+
+I also tried to make the board in Eagle. The process was exactly similar:
+
+1. Adding components in schematic:
+
+
+2. Connecting and labelling:
+
+
+3. In board, rearranging and making traces. Set trace width and grid size to 16:
+
+
+4. Exporting is a little different from KiCAD. You need to keep all layers except traces and milling and then export dxf.
+
+
+5. Open in adobe illustrator, set layers and export png in 1000dpi.
+
+
+6. This time I used [mods](http://mods.cba.mit.edu/) [(local version created by Steven Chew)](https://skeatz.github.io/mods/) to generate nc files.
+
+
+
+FabLab SP uses stepcraft machines that work with nc format.
+
+
#### Milling and Stuffing
I started to mill the board, solder the components by following the workflow described in [Electronics Production week](./Electronics Production.md).
@@ -199,11 +242,5 @@ Programming and testing of the board is done during the [Embedded Programming](.
4. Design Files
---
-[KiCad Schematic](./images/ed/attiny44.sch.zip)
-[KiCad pcbnew](./images/ed/attiny44.kicad_pcb.zip)
-[SVG](./images/ed/attiny44-brd.svg)
-[AI](./images/ed/attiny44-brd.ai.zip)
-[traces.png](./images/ed/traces.png)
-[outlines.png](./images/ed/outlines.png)
-[traces - toolpath for srm20](./images/ed/traces.srm20.rml.zip)
-[outlines - toolpath for srm20](./images/ed/outlines.srm20.rml.zip)
+[All design files in KiCad for SRM20 (rml)](./images/ed/attiny44.sch.zip)
+[All design files in Eagle for Stepcraft (nc)](./images/ed/Kicad_SRM20.zip)
diff --git a/docs/images/ed/Eagle_stpcrft.zip b/docs/images/ed/Eagle_stpcrft.zip
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diff --git a/docs/images/ed/attiny44-brd.ai.zip b/docs/images/ed/attiny44-brd.ai.zip
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diff --git a/docs/images/ed/attiny44-brd.svg b/docs/images/ed/attiny44-brd.svg
deleted file mode 100644
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--- a/docs/images/ed/attiny44-brd.svg
+++ /dev/null
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diff --git a/docs/images/ed/attiny44.kicad_pcb.zip b/docs/images/ed/attiny44.kicad_pcb.zip
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