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Customer Check-In

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 plant key:

genovese basil parsley sweet basil stevia stevia lettuce
genovese basil thyme sweet basil stevia stevia kale

The plants like the new lighting.  As more mature leaves (past the cotyledon) started to appear, I started feeding them the leafy plant nutrients I discussed in this blog post at a strength of ~ 1/10 the EC value of basil (using info on my First Grow spreadsheet).  I haven’t added back the lettuce and kale plants I managed to destroy.

Growth Sensor Puck

ChallengesBringOpportunitesYIPPEE!  THANK YOU SPARKX FOR PUBLISHING YOUR CCS811 BOB

Updated Schematic and BoM

I took SparkX’s CCS8 Eagle Schematic/Layout (GitHub location) to a Kicad evolution of the Growth Sensor Puck schematic (GitHub location).  The “big” difference is the inclusion of the Si7006.  I ran makedigikeyBOM (ooh – it worked AND I found a “bug” in the jellybean parts file!):

Reference Value Quantity Manf Part # Digikey Part # 1 10 100 1000 Qty Avail Link
R4,R5 100K 2 ERJ-6GEYJ104V P100KACT-ND 0.1 0.025 0.01 0.00451 523146 http://www.digikey.com/scripts/DkSearch/dksus.dll?WT.z_header=search_go&lang=en&keywords=P100KACT-ND
U1 Si7006 1 SI7006-A20-IM 336-3124-ND 2.08 2.08 1.7372 1.56551 2158 http://www.digikey.com/scripts/DkSearch/dksus.dll?WT.z_header=search_go&lang=en&keywords=336-3124-ND
R7 10K 1 C0805JR-0710KL 311-10KARCT-ND 0.1 0.016 0.0066 0.00297 2775278 http://www.digikey.com/scripts/DkSearch/dksus.dll?WT.z_header=search_go&lang=en&keywords=311-10KARCT-ND
C2 1u 1 TMK212BJ105KG-T 587-1291-1-ND 0.16 0.115 0.0541 0.03139 231010 http://www.digikey.com/scripts/DkSearch/dksus.dll?WT.z_header=search_go&lang=en&keywords=587-1291-1-ND
C1 .1u 1 CL21F104ZBCNNNC 1276-1007-1-ND 0.1 0.029 0.0128 0.00718 1016710 http://www.digikey.com/scripts/DkSearch/dksus.dll?WT.z_header=search_go&lang=en&keywords=1276-1007-1-ND
U2 CCS811 1 CCS811CT-ND CCS811CT-ND 12.76 10.073 7.1632 7.1632   http://www.digikey.com/scripts/DkSearch/dksus.dll?WT.z_header=search_go&lang=en&keywords=CCS811CT-ND
R1,R2,R3 4K7 3 RC0805FR-074K7L 311-4.70KCRCT-ND 0.1 0.019 0.0077 0.00345 2362052 http://www.digikey.com/scripts/DkSearch/dksus.dll?WT.z_header=search_go&lang=en&keywords=311-4.70KCRCT-ND

Looking through my box-o-parts (I standardize on 0805 when possible):

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Besides the CCS811 and Si7006, I do not have 4K7 resistors.  I added these to my current Digikey backorder for the CCS811 and the Si7006.

PCB Layout

A challenge I have with Kicad is finding footprints when I am in cvpcb.  One example is the footprint for the optional 10k thermistor that has a through hole footprint.  I was challenged to find a tht resistor footprint that had a 2.54mm spacing.

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the image is from this data sheet.  So I made my own.  Simple to do but I can’t help thinking I’m wasting my time since these footprints probably exist.

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and…yah…i think i wasted my time making the layout (even if it was simple…I certainly am not getting younger 🙂 )…further bumbling within cvpcb lead me to the Socket_Strips library.  Where I associated the optional thermistor with the 1 x 02 straight socket strip with a 2.54 mm pitch.

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Design Rules

It would be a D’OH moment if the board was turned back from OSHPark because I did not adhere to their design rules.  It’s been awhile since I sent a PCB to OSHPark so I went back to check OSHPark’s design rules:

  • 6 mil minimum trace width
  • 6 mil minimum spacing
  • at least 15 mil clearances from traces to the edge of the board
  • 13 mil minimum drill size
  • 7 mil minimum annular ring

I discussed what the design rules refer to (e.g.: the term “annular ring” was not a term I was familiar with) in this post.

Based on what I used in the post, here are the design rules I am using for tracks and vias:

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That’s as far as I got today…excited to see what I can do tomorrow. 

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