Sunflower prototypes, Revisions 1–4

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The ADXL 320 and its bandwidth limiting caps.
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with some manually applied solder mask.
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Revision 2 boards, top surface. These were designed 16-up on a 4-layer PCB (FR4 laminate), manufactured by expresspcb.
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Almost fully populated r2 board. Clockwise from top right: MSP430 uC, SMT LED, MEMS microphone, color light-to-frequency converter, 16Mb FLASH, pads for accelerometer (unpopulated)
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partly populated bottom surface of r2
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The r2 boards are about the size of a squared penny
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part of the 16-up board that get cut/broken-out, and a penny
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r2 board, minus the accelerometer
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r2 and penny
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programming cable atachement to TI FET cable.
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r3 board, fully populated, shown with a dime (left) and a penny (right)
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Fully populated r3 board.
Library - 061
Library - 065
Library - 074
Library - 088
Library - 091
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Sunflower R4, bare board, bottom
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Sunflower R4, bare board, top
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Partially populated Sunflower R4, top
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Sunflower R4 and USD 0.25
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Sunflower R4, top, missing the TPS61070 regulator
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Ideally the stamp should've had a sunflower, but I only had a Hyacinth stamp on hand
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This is what happens when you try soldering the Hirose connector after drinking coffee
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Populating passives on bottom surface of Sunflower R4
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Hand-soldered QFN-32 package. Nice, shiny solder joints.
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Populated TPS61100 (dual-output regulator driving the 1.8 and 2.7V rails), and a (correctly) soldered Hirose connector
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Almost completely populated R4 bottom surface. Top left: Xilinx XC2C32A CPLD, top center: Hirose connector, top right: MSP430F1232, bottom center: ADXL320 accelerometer, bottom left: TPS61100
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Spot the cut trace ?
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Notice the spliced-in Schottky Diode ?
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Fully-assembled top surface
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Fully-assembled bottom surface, except for the Flash memory device (thanks Apple Inc for depleting the world's supply!)
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Direct-sunlight measurements
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Soldering the TPS61100 onto the Sunflower R4 PCB




Photo montage