If you’ve never heard about electronic paper, crawl out from under that rock and read up on the Sony reader and the Amazon Kindle. E-paper is a flexible display made of color-changing beads that simulate ink-on-paper for easy daylight reading. The revolutionary thing about e-paper is that after it’s set, it stays that way without additional power.
This sounds great in theory, but Esquire’s cover is the first time everybody can afford to hack an e-paper display. We took the cover into the Hack a Day lab to document, test, and hack. In the end, we recycled it into something beneficial that any individual can build. We’ve got all the details on how the display works and what it takes to use it in your own projects. read about our e-paper clock hack below.
Pozadí
The Esquire e-paper cover hit big on the net, but was swiftly panned. NOTCOT has beautiful scans of the circuit board and e-paper. popular science posted instructions for reading the code with a PICkit2. [Slaxter] verified that the photo chip can be read, and that the code protection fuses are off. [Matt] manipulated the e-paper cells directly with skillful soldering and an Arduino. So far, there hasn’t been a lot of interest in repurposing the e-paper, or reprogramming the existing microcontroller.
E-paper panels
The actual e-paper panels, manufactured by E-Ink, aren’t that exciting. Each panel has a set of predefined segments, 11 on the front panel and 3 on the rear Ford advertisement. This isn’t a matrix that we can reprogram into an e-reader. [just_mike] has a great set of ultra close-up shots of the individual beads that make up each segment.
Each e-paper segment has an individual connection, and a connection that’s shared with other cells on the panel. The segments become white or black depending on the direction of current applied to the cell. When common is low, any segment that is also connected high will darken. When common is high, each cell connected to ground will clear. The PCB uses 16 volts from five 3.3volt batteries to switch the cells, but [Slaxter] showed that 5volts was sufficient with his Arduino project.
Performance testing
We made several observations about the e-paper operating specifications.
First, it takes nearly 0.5 seconds to completely darken or clear a cell. In the video you can see the partial states created by switching the e-paper too fast. We’re not quite sure of the optimal change time, but between 0.25 and 0.5 seconds seems to be the minimum.
This also raised questions about the maximum change time. Does it damage the e-paper to apply current for longer than necessary? Does the e-paper continue to consume current as long as it’s applied, wasting the batteries? We took special care in our code to return all outputs to ground after a change to avoid a continuous current through the panel.
Clearing and darkening need to be done separately. It takes two complete operations to fully freshen the screen; one to clear old segments, one to darken new segments. A smart programmer will think they can save a cycle when only adding or removing items, and not doing both. This is true to some extent, but continuous manipulation of one cell without refreshing adjacent cells causes color ‘creep’. In the video, a flashing background without updates to any other segments swiftly drives the inactive segments to a mid-state between dark and light.
Driver board
The motorist consists of an eight-pin Microchip PIC12F629, two 4094 shift registers, and some supporting components.
Click here for a full size pin diagram of the e-paper motorist board(PNG).
Batteries
Esquire invited hacks of their cover with the rather lame suggestion of replacing the batteries. This makes sense, the covers were shipped all over the world in refrigerated containers to help extend the battery life. even with that effort, Esquire says that the batteries will last a few months.
Batteries 1-5 are in series and supply a 15-16volt switching current for the e-paper. The sixth battery supplies 3volts for the PIC. No word yet on which batteries die first. If you want to ‘replace’ your batteries, you’ll need to desolder the old ones, and supply a 5-16volt e-paper supply, and 3volt microcontroller supply, at the points indicated.
We eventually had to replace our microcontroller battery because we abused it a bit during development. A button battery holder with 20mm pin spacing will fit the existing holes. Mouser #534-106 will probably work, but this is unconfirmed.
4094 shift registers (IC1, IC2)
The shift registers switch the e-paper segment controls at 16 volts.
The two 4094 ICs are shift registers setup to cascade data from IC1 to IC2. This basic shift register is a minor variation on the 74HTC595 we used in our graffiti wall. The main difference is that the 4094 strobe line is usually low, and briefly pulled high to put new values on the output pins. We observed that the 4094 requires long clock and strobe pulses. This could be due to lazy drive circuitry between the photo and the 4094, or just the nature of the 4000 series.
4094 segment output map
IC
Výstup
Adresa
Spojení
1
Q1.
0x01.
FRONT_BOX_SYMBOL_DNA
1
Q2
0x02.
FRONT_BOX_GUY
1
Q3
0x04
FRONT_BOX_FIREWORKS
1
Q4
0x08
FRONT_ON_THE_WEST_COAST
1
Q5
0x10
FRONT_THREE_HOURS_LATER
1
Q6
0x20
FRONT_ESQUIRE
1
Q7
0x40
FRONT_BOX_GIRL
1
Q8
0x80
FRONT_NOW
2.
Q1.
0x100
FRONT_BEGINS
2.
Q2
0x200
FRONT_21ST_CENTURY
2.
Q3
0x400
FRONT_BACKGROUND
2.
Q4
0x800
FRONT_COMMON
2.
Q5
0x1000
BACK_COMMON
2.
Q6
0x2000
BACK_LEFT
2.
Q7
0x4000
BACK_CENTER
2.
Q8
0x8000
BACK_RIGHT
12F629
Click here for a full size schematic drawing(PNG). An eight pin PIC12F629 drives the 4094 shift registers that control each e-paper segment. two pins are unused (GP4, GP5).
The MCLR feature is enabled with resistor R8. The design doesn’t include a diode to secure the photo from the 13volt programming current. Microchip recommends this, but there’s no other sensitive ICs sharing the circuit so maybe the designer felt a resistor was sufficient protection.
Three pins drive the data, clock, and strobe lines of the 4094 (GP0, GP1, GP2). The 4094 has to be interfaced at the same voltage it switches, 16 volts, so the photo switches the interface pins through transistors. As far as we can tell, the 4094 control lines are pulled high with a resistor. The photo switches a transistor on, and it pulls the line to ground. The interface to the 4094 is backwards. A photo high pin is seen as low at the shift register, and low is seen as high. The interface won’t work unless reversed.
The programming pins are brought to a header at the top of the PCB. We soldered standard .1″ pin header into the holes supplied (Mouser #571-41033290). The two programming pins, PGD and PGC, are shared with the circuitry that drives the shift registers. We were able to read the device with an ICD2 debugger. We couldn’t reprogram it though, probably because of the shift register driver. has any individual had success? Regardless, the shared pin arrangement makes it impossible to do in-circuit debugging on this device.
PIC pin connections
Kolík
název
Spojení
1
VDD
+3.3volts
2.
GP5
—
3.
GP4
—
4.
GP3
MCLR (program VPP)
5.
GP2
4094 Strobe
6.
GP1
4094 Clock (program clock)
7
GP0
4094 data (program data)
8
VSS
Přízemní
Tap the board
It’s easy to tap into the board and use it with your favorite microcontroller. All but one of the required interface signals are already brought to a header. The strobe line can be tapped through the by means of indicated by the arrow. You don’t want the photo to interfere with your new controller, so remove it or deactivate it by severing the power pin.
Interface library
Our first effort to drive the board involved our PIC24F-based tiny web server. It was handy, and the PIC24F is easy to work with. We perfected our interface library on a low-power MSP430. Both versions are in the project archive(ZIP), but the MSP430 version of the library is a lot more mature.
The library includes a software bit-bang routine, functions for interfacing the board, and address definitions for the segment and common lines. options in esquire_eink.h enable a bit-bang delay and set its length; we found the 4094 lazy and in need of a lengthy clock pulse. The initBang() function sets the direction of the pins, and must be changed to suit your microcontroller. call it, or set your IO pins to output elsewhere:
1
bangInit(); //set bitbang pins to output
The setSeg() function sets the passed segments dark (1) or clear (0):
1
2.
setSeg(FRONT_BOX_GUY+FRONT_BACKGROUND, 1); //set(dark) these segments
setSeg(FRONT_21ST_CENTURY,0);//clear (light) these segments
The setSeg() function includes a color change delay defined by EINK_DELAY in esquire_eink.h. At the end of the delay it returns the shift register pins to ground. We want to avoid damaging to the e-paper or wasting the batteries, though we don’t really know if this is necessary.
One thing we observed about setSeg() was that manipulating single cells causes adjacent cells to regress toward a mid-color. We developed the setDisplay() function to combat this by fully refreshing the display every time. setDisplay() includes a pause for each change, and then returns the shift register outputs to ground. just pass the segment arrangement for a fully refreshed display:
1
setDisplay(FRONT_ESQUIRE+BACK_LEFT);//XX dark, everything else clear
You can access the shift registers directly with the bangIt() function, but consider returning the shift registers outputs to ‘0’ after the e-paper color change is complete. You could damage the e-paper or cause excessive current drain if you leave it on, if that’s actually ‘a thing’.
1
2.
3.
bangIt(0b1110000000000000);//all back panel segments on
pause();//wait for the color change
bangIt(0x0000);//return all outputs to ground
To port the library to your microcontroller, just check the pin configurations in esquire_eink.h, and the pin setup function bangInit() in esquire_eink.c. keep in mind that the pin directions are reversed by the interface transistors.
Putting it to use, an e-paper clock
We wanted to do something beneficial with the first cheap consumer e-paper panel. It had to be something pretty easy so that lots of people can recycle this cool piece of technology. We couldn’t resist doing what so lots of make with old display tech: make a clock. Schematics, firmware, and art templates are in the project archive(.zip).
There’s so few segments on the e-paper that we can only partially represent the time. six segments show time, each fades to reveal the time to the nearest ten minutes past the hour. We also flash eye-candy on the non-time segments of the panel. Here’s the custom-made bezel we created. This bezel, and a theme to make your own, are included in the project archive(ZIP). We printed our bezel mirrored so the ink is protected from scratches.
Hardware
We were inspired by the low-power properties of e-paper to use Texas Instruments’ MSP430 line of 16-bit microcontrollers. With the ideal configuration, the MSP430 draws so little power that it’s only limited by the shelf life of a battery. We can even give the original designers a run for their money, and see if we can make a lower power device.
The best thing about the MSP430 is that you can get a kit with a USB programmer/debugger and breakout board for only 20 bucks. It comes with a complimentary C compiler limited to 4K, but the F2013 only has 2K of memory. This is a complete development tool, no soldering involved. learn a lot more about working with the MSP430 in this how-to.
This schematic shows how we connected our MSP430 to the e-paper motorist board. Click here for a full size version(PNG). The 47K resistor, MSP430, and an LED (not shown) are included on the breakout board.
We added a 32.768KHz crystal to keep time (Q1). Normally, we’d also add some capacitors to form an oscillator, but the MSP430 has built-in adjustable capacitors on P2.6 and P2.7.
We also added a button between P1.4 and P1.2 (S1). The internal pull-up resistor on P1.4 holds the button high, and we grounded it through P1.2. This isn’t the best arrangement, it would probably be wise to also connect P1.2 to ground.
We slid the MSP430 breakout board over the power and ground pins of the programming header. You can connect the clock and data pins to the header too, but we made a decision to route them all from the vias underneath. remember to remove the photo so it doesn’t interfere with signals from the MSP430.
Parts
Číslo
Náklady
Esquire e-paper cover
—
—
MSP430 ez430 development kit
ez430USB
$20
32.768KHz crystal
815-AB26T-32.768KHZ
$0.27
Stiskněte tlačítko
642-mjtp1250
$0.16
Firmware
The clock software is written with the complimentary demo version of the TI/IAR Kickstart C compiler included with the ez430 programmer.
The MSP430 is very low power. It uses just 220uA at 1MHz, but less than 6uA when sleeping. The crucial to long battery life is to keep the chip asleep as much as possible. Our clock code is written with this in mind.
We use timer_a with the 32.768khz crystal to create an interrupt twice each second. The first interrupt triggers code that configures the segments to be displayed, sends these values to the e-paper, and then sleeps for the next 0.5 seconds. While the MSP430 sleeps, all the ‘off’ segments have time to clear. The next interrupt flips the common lines the other way with a basic XOR, outputs the values, and goes to sleep for another 0.5 seconds. next time the cycle will begin again. We don’t bother to reset the shift registers to the ‘0’ position because the freshen is regularly in flux. segment creep isn’t a problem because we freshen every segment each cycle.
A button press triggers an interrupt that advances the time to the next 10 minutes. To set the clock, wait until the time is a aspect of 10 minutes past the hour and press the button to show the corre