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Prototypes

corecode edited this page · 58 revisions

Unassembled kit in parts.

These prototype kits are meant for early adopters, who would like to evaluate and verify the electrical design of the MC HCK, and those who want to contribute to the growing software library. Have a look at the step-by-step instructions.

Kits will come pre-programmed with bootloader and allow firmware update via USB.

Kit cost is $60 including PayPal fee and international shipping from Switzerland or the European Union (your choice). The following cost calculation is approximate and does not include import duties that we will have to pay.

To get to this price level, we need to purchase parts for 50 kits, and also sell 50 kits. If we don’t get to at least 40 kits within one month, we will refund all payments.

Factory lead times and slightly poor planning on my side have moved the shipment to end of September 2013.

Contents

Prices are rough estimates. See below for a complete budget calculation.

Count Description Digikey Taobao (RMB) Estimated Total with margin (USD)
shipping 4
5 MCU 2.0736 15.5
5 boards 0.61 (Hackvana) 4
5 discretes 1
2 NRF24L01+ RF board 4.40 5
2 MCP73831T-2ACI LiPo charger IC 0.42 2.00 1.5
2 180mAh LiPo battery 3.90 4
2 W25Q80BV 1MB SPI flash 0.353 1.20 2
1 MIC5205-3.3 16V LDO 0.4368 0.80 1
1 LM3671MF-3.3 buck IC 0.7776 0.80 2.5
1 TPS61097-33 boost IC 2.09 4.50 2.5
2 Micro-USB AB receptacles 0.5687 2
3 32.768kHz RTC XTAL 0.14 0.19 2
total 47.0

This allows you to build 5 standard MC HCKs, and run RF communications, autonomous nodes, log large amounts of data, and run from a variety of power sources. Not all of these options have been verified to work yet, but that’s what this prototype kit is for.

Packing list

Item Desc Desig Count Total Packed
CL10B104KO8NNNC 100n C3,C4,C5,C6,C10 22 1100 x
RC1608J330CS 33R R1,R2 10 500 x
JMK107BJ225KA-T 2.2u C1,C2 10 500 x
MK20DX32VLF5 MCU U1 5 250
1622866-1 1k R3 5 250 x
LY Q976-P1S2-36 LED D1 5 250 x
PTS810 SJM 250 SMTR LFS button S1 5 250
PCB 5 250
CL21A475KOFNNNE 4.7u C7,C11,C12 4 200 x
CC0805KKX5R5BB106 10u C11,C12 4 200 x
AB26T-32.768KHZ RTC Xtal Y1 3 150
MMZ1608B601C ferrite FB1 3 150 x
RB521S30T1G Schottky D2,D3 3 150 x
10104111-0001LF Micro USB J3 2 100 x
NRF24L01+ board 2 100
MCP73831T-2ACI LiPo chrg U2 2 100 x
RC1608J330CS 20k R4 2 100 x
LiPo battery 2 100
02ZR-8M-P conn IDC 2 100
B2B-ZR(LF)(SN) conn hdr 2 100
W25Q80BVSNIG SPI flash U3 2 100
CIG21L4R7MNE 4.7u L1 2 100 x
SPX5205M5-L-3-3 LDO U4 1 50
RMCF0805ZT0R00 0R L1 1 50 x
LM3671MF-3.3 buck U4 1 50 x
TPS61097-33DBVT boost U4 1 50 x

Budget breakdown

I did add my own parts to orders, in this case I weigh auxiliary costs in proportion to parts costs. I calculate 110% of needed parts (except for some where I could not order them), to cover for possible defects.

I ordered more parts to benefit from higher volume price breaks; prices below benefit from these price breaks and do not consider what it would have cost without me taking the surplus to get the benefit.

This budget is incomplete, more parts and invoices are incoming.

Group Item Count Unit Price Amount Group Cost
Parts from China
LiPo batteries 100 CNY 3.90 / 0.66 65.52
RF modules 100 CNY 4.20 / 0.74 73.92
QFP48 sockets 2 CNY 175.00 / 29.40 58.80
Shipping in China 10.08
TaoBao agent fee 10.43
UPS 49.43
PayPal fee (approx) 11.30
Credit card fee CHF 4.18
Import tax CHF 19.49
279.48
CHF 23.67
DigiKey
LED CHIPLED 587NM YLW 0603 SMD 275 0.05032 13.838
CAP CER 2.2UF 6.3V 10% X5R 0603 550 0.02680 14.74
CAP CER 0.1UF 16V 10% X7R 0603 1210 0.00468 5.6628
RES 33 OHM 1/10W 5% 0603 550 0.00274 1.507
RES 1.00K OHM 1/10W 1% 0603 275 0.00266 0.7315
CRYSTAL 32.768KHZ 12.5PF THRU 165 0.14000 23.1
CONN RCPT STD MICRO USB TYPE AB 110 0.56870 62.557
CAP CER 10UF 6.3V 10% X5R 0805 220 0.03399 7.4778
IC FLASH 8MBIT 104MHZ 8SOIC 110 0.35300 38.83
IC REG LDO 3.3V 0.15A SOT23-5 55 0.37440 20.592
CAP CER 4.7UF 16V 10% X5R 0805 220 0.03840 8.448
IC CONTROLLR LI-ION 4.2V SOT23-5 110 0.42000 46.2
RES 0.0 OHM 1/8W JUMP 0805 55 0.00652 0.3586
IC REG BUCK 3.3V 0.35A SOT23-5 55 0.36450 20.0475
RES 20K OHM 1/10W 5% 0603 110 0.00274 0.3014
INDUCTOR POWER 4.7UH 0.75A 0805 110 0.11048 12.1528
Credit card fee CHF 4.87
Import tax CHF 36.21
276.5444
CHF 41.08

Random notes for packaging prototype kits

Prices are including shipping and import tax (Switzerland)

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