PUGAUGE - Low Power Display Processor

The PUGAUGE is intended to be a base platform for devices to display Information in an environment where low power requirements are mandatory.

Examples are:

• Bike computers
• Thermometers
• mobile measurement devices

Hardware

• 8-Character Segmented LCD 14-segment Display
• Atmel AVR ATmega6490A AVR microcontroller

Software

Platform

The PUGAUGE is intended to be Arduino-compatible. The application software shall benefit from the ease of use, familiarity of many developers and availability of many libraries for sensors and other peripherals.

Therefore, an extension to the Arduino IDE is developed to allow the PUGAUGE being selected as a board type in the Arduino IDE. This should not be too complicated, as the PUGAUGE processor is an Atmel AVR processor closely related to the Atmel AVR processors used in the Arduino UNO and MEGA.

Additionally the optiboot bootloader for the Arduino is being modified to run on the PUGAUGE and allow Arduino sketches to be uploaded onto the PUGAUGE.(zu ergänzen)

Application

A special LCD library is being developed that provides easy access to the on board LCD ( 8 characters, 14 segments plus decimal point and apostroph).(zu ergänzen)

Build notes

Connection of ATmega6490

In the first development version all circuitry is mounted on a solderless breadboard:

• The ATmega6490 is mounted on the BBR.
• LCD-Voltage Buffer Capacitor: 3x220nF FKC in parallel from ATmega6490 Pin 1 / BBR Pin 76 to GND
• System Status LED: Port line PB0 (ATmega6490 Pin 19 / BBR Pin 94) to 330 Ohm to yellow LED to GND
• In-System-Programmer (IST) USPasp connected to 10-pin 2x5 100mil-spaced Connector:

See also http://nerdyelectronics.com/usbasp-tutorial/ :

                                                           Connector seen on board pins
USBasp pin number USBasp pin MCU Pin                          +---+---+---+---+---+
1 	          MOSI       MOSI                             | 2 | 4 | 6 | 8 |10 |
5                 Reset      Reset                            +---+---+---+---+---+
7                 SCK        SCK                              | 1 | 3 | 5 | 7 | 9 |
9                 MISO       MISO                             +---+---+---+---+---+
10                GND        GND
2                 Vcc        Vcc

Signal name	description	10-pin-conn pin number	ATmega6490 pin name	ATmega6490 pin number	BBR pin number
MOSI	data from programmer to MCU	1	MOSI	21	96
Reset	reset pulse to MCU	5	Reset	30	5
SCK	serial clock to MCU	7	SCK	20	95
MISO	data from MCU to programmer	9	MISO	22	97
GND	Ground reference	10	GND	99,11,32,81	74,86,7,56
VCC	+5V supply from programmer	2	VCC	100,10,31,80	75,85,6,55

• Serial-USB Adapter, connected to TXD/RXD of UART0 of ATmega6490:

Signal name	description	FT323-adapter pin	ATmega6490 pin name	ATmega6490 pin number	BBR pin number
GND	Ground reference	GND	GND
TXD	data from USB to MCU	TXD	RXD/PCINT0/PE0	2	77
RXD	data from MCU to USB	RXD	TXD/PCINT1/PE1	3	78

TQFP-100 Breakout board

When soldering the AVR6490 Chip in the TQFP-100 case to it's breakout board, I made an error:

I turned it 90 degrees to the right. Therefore Pin 1 of the chip appears at Pin 76 of the breakout board.

The algorithm to find the BBR pin when knowing the pin number on the TQFP-100 package of the ATmega6490 is:

BBR-pin = (TQFP-pin + 75) MOD 100

This table provides a correction lookup:

Pin of TQFP-100 ATmega6490A	Pin of breakout board	Pin of TQFP-100 ATmega6490A	Pin of breakout board
1	76	51	26
2	77	52	27
3	78	53	28
4	79	54	29
5	80	55	30
6	81	56	31
7	82	57	32
8	83	58	33
9	84	59	34
10	85	60	35
11	86	61	36
12	87	62	37
13	88	63	38
14	89	64	39
15	90	65	40
16	91	66	41
17	92	67	42
18	93	68	43
19	94	69	44
20	95	70	45
21	96	71	46
22	97	72	47
23	98	73	48
24	99	74	49
25	100	75	50
26	1	76	51
27	2	77	52
28	3	78	53
29	4	79	54
30	5	80	55
31	6	81	56
32	7	82	57
33	8	83	58
34	9	84	59
35	10	85	60
36	11	86	61
37	12	87	62
38	13	88	63
39	14	89	64
40	15	90	65
41	16	91	66
42	17	92	67
43	18	93	68
44	19	94	69
45	20	95	70
46	21	96	71
47	22	97	72
48	23	98	73
49	24	99	74
50	25	100	75

Connecting D301 LCD to ATmega6490 MCU

LCD pin name	pin functions	MCU pin name	MCU pin number	BBR pin number
pin_1	function/plane digit segment com1 1 seg_s com2 1 seg_f com3 1 seg_e com4 1 seg_d	SEG2	72	47
pin_2	function/plane digit segment com1 1 seg_i com2 1 seg_j com3 1 seg_k com4 1 seg_n	SEG3	71	46
pin_3	function/plane digit segment com1 2 seg_s com2 2 seg_f com3 2 seg_e com4 2 seg_d	SEG6	68	43
pin_4	function/plane digit segment com1 2 seg_i com2 2 seg_j com3 2 seg_k com4 2 seg_n	SEG7	66	41
pin_5	function/plane digit segment com1 3 seg_s com2 3 seg_f com3 3 seg_e com4 3 seg_d	SEG10	63	38
pin_6	function/plane digit segment com1 3 seg_i com2 3 seg_j com3 3 seg_k com4 3 seg_n	SEG11	58	33
pin_7	function/plane digit segment com1 4 seg_s com2 4 seg_f com3 4 seg_e com4 4 seg_d	SEG14	55	30
pin_8	function/plane digit segment com1 4 seg_i com2 4 seg_j com3 4 seg_k com4 4 seg_n	SEG15	54	29
pin_9	function/plane digit segment com1 5 seg_s com2 5 seg_f com3 5 seg_e com4 5 seg_d	SEG18	51	26
pin_10	function/plane digit segment com1 5 seg_i com2 5 seg_j com3 5 seg_k com4 5 seg_n	SEG19	50	25
pin_11	function/plane digit segment com1 6 seg_s com2 6 seg_f com3 6 seg_e com4 6 seg_d	SEG22	47	22
pin_12	function/plane digit segment com1 6 seg_i com2 6 seg_j com3 6 seg_k com4 6 seg_n	SEG23	46	21
pin_13	function/plane digit segment com1 7 seg_s com2 7 seg_f com3 7 seg_e com4 7 seg_d	SEG26	43	18
pin_14	function/plane digit segment com1 7 seg_i com2 7 seg_j com3 7 seg_k com4 7 seg_n	SEG27	41	16
pin_15	function/plane digit segment com1 8 seg_s com2 8 seg_f com3 8 seg_e com4 8 seg_d	SEG30	38	13
pin_16	function/plane digit segment com1 8 seg_i com2 8 seg_j com3 8 seg_k com4 8 seg_n	SEG31	37	12
pin_17	function/plane digit segment	COM3	75	50
pin_18	function/plane digit segment	COM2	76	51
pin_19	function/plane digit segment	COM1	77	52
pin_20	function/plane digit segment	COM0	78	53
pin_21	function/plane digit segment com1 8 seg_a com2 8 seg_b com3 8 seg_c com4 8 seg_p	SEG28	40	15
pin_22	function/plane digit segment com1 8 seg_h com2 8 seg_g com3 8 seg_l com4 8 seg_m	SEG29	39	14
pin_23	function/plane digit segment com1 7 seg_a com2 7 seg_b com3 7 seg_c com4 7 seg_p	SEG24	45	20
pin_24	function/plane digit segment com1 7 seg_h com2 7 seg_g com3 7 seg_l com4 7 seg_m	SEG25	44	19
pin_25	function/plane digit segment com1 6 seg_a com2 6 seg_b com3 6 seg_c com4 6 seg_p	SEG20	49	24
pin_26	function/plane digit segment com1 6 seg_h com2 6 seg_g com3 6 seg_l com4 6 seg_m	SEG21	48	23
pin_27	function/plane digit segment com1 5 seg_a com2 5 seg_b com3 5 seg_c com4 5 seg_p	SEG16	53	28
pin_28	function/plane digit segment com1 5 seg_h com2 5 seg_g com3 5 seg_l com4 5 seg_m	SEG17	52	27
pin_29	function/plane digit segment com1 4 seg_a com2 4 seg_b com3 4 seg_c com4 4 seg_p	SEG12	57	32
pin_30	function/plane digit segment com1 4 seg_h com2 4 seg_g com3 4 seg_l com4 4 seg_m	SEG13	56	31
pin_31	function/plane digit segment com1 3 seg_a com2 3 seg_b com3 3 seg_c com4 3 seg_p	SEG8	65	40
pin_32	function/plane digit segment com1 3 seg_h com2 3 seg_g com3 3 seg_l com4 3 seg_m	SEG9	64	39
pin_33	function/plane digit segment com1 2 seg_a com2 2 seg_b com3 2 seg_c com4 2 seg_p	SEG4	70	45
pin_34	function/plane digit segment com1 2 seg_h com2 2 seg_g com3 2 seg_l com4 2 seg_m	SEG5	69	44
pin_35	function/plane digit segment com1 1 seg_a com2 1 seg_b com3 1 seg_c com4 1 seg_p	SEG0	74	49
pin_36	function/plane digit segment com1 1 seg_h com2 1 seg_g com3 1 seg_l com4 1 seg_m	SEG1	73	48