Hello!! The new SunLeaf hardware is getting ready for fabrication finally after some more tweaking and preparation. So as for fabrication of the next revisions SunLeaf version 0.2a (a = alpha) the plan is to do another prototype run of 3-10 boards and hand assemble them testing desired functionality and noting fixes for future revs. At the same time I've been running the SunLeaf 0.2a through Macrofab's wonder fabrication platform. The goal of this new design is to get a hardware module that is working problem free with all our desired features functioning then to scale up and produce a pile of boards for beta testers and users !

So for the prototype run, we are currently evaluating fab house for quickturn manufacturing. I typically use OSHPark for all prototypes but as time keeps going by it might be cutting it close with their services. Either way I created renders of the new board with there fab:

Top View:

Bottom View:

The board is only about 2 dollars more expensive than the last revisions with an order total of around 47 dollars for a round of 3 from OSHPark. The necessary adjustments in size didn't hurt us on cost very much wihich is great.

Moving onto the bill of materials, everything for the prototype BOM comes from Digikey with the expception of the ESP-09 module that is ordered from a user on Tindie who imports them to the US. The BOM is simple it just explains the parts used, how much one costs in qty of one and the overall cost to build one SunLeaf. If you are feeling ambitious have at it, order some parts and boards and solder them up we'd love to hear about it. Anyways here is the BOM:

Designator	MFR #	Digikey#	Cost (QTY 1)	Quantity	Build Cost QTY
IC1	ESP_09	https://www.tindie.com/products/George/esp8266-esp-09-module/?pt=full_prod_search	4.98	1	4.98
FD3,FD2,FD1	FIDUCIAL		0	3	0
U2	BQ24210DQCT	296-28738-1-ND	3.19	1	3.19
U5	PCA9518DBQR	296-22764-1-ND	1.94	1	1.94
D1	BAT20JFILM	497-3381-1-ND	0.44	1	0.44
J11,J16,J9,J12,J13,J15,J14,J10,J8,J7,J6,J5	B4B-PH-K-S(LF)(SN)	455-1706-ND	0.24	12	2.88
D7,D6,D8,D9,D11,D12,D13,D10,D3,D5,D2,D4	PESD3V3L2BT,215	568-4041-1-ND	0.47	12	5.64
DA1	ESDA6V1BC6	497-6635-1-ND	0.42	1	0.42
Q2,Q1	DMG2307L-7	DMG2307L-7DICT-ND	0.38	2	0.76
X2	ABS07-32.768KHZ-9-T	535-9544-1-ND	0.77	1	0.77
X1	ABM3B8.000MHZB2T	535-9720-1-ND	0.66	1	0.66
D14	RSB39VTE-17	RSB39VTE-17CT-ND	0.45	1	0.45
J3	B2B-PH-K-S(LF)(SN)	455-1704-ND	0.17	1	0.17
J4	B3B-PH-K-S(LF)(SN)	455-1705-ND	0.19	1	0.19
T1	1909763-1	A118077CT-ND	0.58	1	0.58
U4	74HC4052D	568-1456-1-ND	0.5	1	0.5
U1	STM32F446RET6	497-15376-ND	8.59	1	8.59
J1	20021121-00010C4LF	609-3695-1-ND	0.8	1	0.8
R42,R40,R3,R1	RC1005F103CS	1276-3431-1-ND	0.1	4	0.4
H2,H1,H3	M2.5_Hole			3	0
R41,R39,R23,R18,R15,R14,R16,R26,R8,R6,R2,R11,R10	RC1005F102CS	1276-3430-1-ND	0.1	13	1.3
FB2	MI0603K300R-10	240-2373-1-ND	0.1	1	0.1
SW1,SW2	B3U-1000P	SW1020CT-ND	1.18	2	2.36
P2	CONN_01X03			1	0
LED1	LTST-C193TBKT-5A	160-1827-1-ND	0.47	1	0.47
R37,R38	ERA-3AEB3741V	P3.74KDBCT-ND	0.63	2	1.26
R9,R20,R19,R17,R12,R21,R13	RC1005F201CS	1276-3959-1-ND	0.1	7	0.7
R36,R35,R29,R30,R31,R28,R27,R33,R32,R34	RC1005F472CS	1276-3466-1-ND	0.1	10	1
R22	RC1005F4870CS	1276-3991-1-ND	0.1	1	0.1
R4,R5	CPF0402B22RE1	A102720CT-ND	0.56	2	1.12
R7	RC1005J473CS	1276-4416-1-ND	0.1	1	0.1
C4,C6,C14,C8,C10,C15,C3,C9,C1,C22,C27,C7,C17,C18	CL05B104JP5NNNC	1276-1506-1-ND	0.1	14	1.4
C11,C12	CL05C180GB5NCNC	1276-1647-1-ND	0.1	2	0.2
C13	CL05A475KQ5NRNC	1276-1481-1-ND	0.36	1	0.36
C2,C5	CL05C090CB5NNNC	1276-1616-1-ND	0.1	2	0.2
FB1	BLM15HG601SN1D	490-3998-1-ND	0.23	1	0.23
P1	CONN_01X04			1	0
C21	CL10A106KQ8NNNC	1276-1038-1-ND	0.24	1	0.24
C20,C19	CL05A105KA5NQNC	1276-1445-1-ND	0.24	2	0.48
LED2	LTST-C191KGKT	160-1446-1-ND	0.29	1	0.29
LED3	LTST-C191KFKT	160-1445-1-ND	0.27	1	0.27
U3	AZ1117CR-3.3TRG1	AZ1117CR-3.3TRG1DICT-ND	0.41	1	0.41
J2	475890001	WM17143CT-ND	0.81	1	0.81
R24,R25	RC1608J202CS	1276-5069-1-ND	0.1	2	0.2
PCB Cost	OSHPark (3 Boards)	48.2		16.1	16.1
				BOM Total Cost	63.06

If you wish to view it as a google spreadsheet the following link will do just that: https://docs.google.com/spreadsheets/d/1kv7WRCuP9jof3ieIvjWm7yBUWpwseHQou-YMSgxwjEM/edit?usp=sharing

So there we are, we have a new board a BOM, and prepping to order, just some more final checks. That's all for now, but expect more posts this week!