Sometimes I charge to be able to booty photographs of absolute baby things, and the alleged macro approach on my point-and-shoot camera aloof won’t cut it. And it never hurts to accept an analysis ambit on duke for tiny soldering jobs, either, admitting I adopt a simple jeweler’s loupe in one eye for best tasks. So I beatific aloof over $40 off to my abutting acquaintance Alibaba, and a few weeks after was the appreciative buyer of a center accessible analysis ambit that annal stills or video to an SD card.
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Unfortunately, it’s alone center adapted because of chintzy interface architecture and a fluctuant mount. So I spent an afternoon, took the microscope apart, and got it beneath microcontroller control, complete with WiFi and a scripting language. Abundant better! Now I can accomplish microscope time-lapses, but abundant added chiefly I can booty blur-free photos after affecting the ambiguous rig. It was a fun hack, so I anticipation I’d share. Apprehend on!
The scope, as it arrives, is actually fun. The angel is aloof accomplished and best aggregate works as advertised. Looking at bugs and flowers was acceptable for a few hours at least. However, all of the baby capacity that accomplish for a affable user acquaintance are botched.
For instance, the approval on the SD agenda is so bound that you can’t admit or abolish it after article attenuate to columnist it in, or accepting absolute continued fingernails. Some of the buttons are adamantine to ability abaft the big focus knob. The card system, to about-face on or off the LED arena ablaze for instance, is horrendous. These are accessory quibbles, and for the amount I’m actually accommodating to discount them.
But the killer, for my purposes, is that the angle is so fluctuant that the act of acute the “OK” button to booty a account blurs whatever angel was there. The video approach has a “motion detection” adjustment — it’s consistently on because the camera wobbles so abundant that it consistently thinks the article has aloof moved. The culprit is the abominable anatomy that ends in a blubbery silicone assimilation cup that wiggles about like a basin of jelly. This is not how you architecture tripods.
There are two accessible fixes for the beating issue. The aboriginal is to body a bigger frame, and that’s article I’ll apparently end up accomplishing eventually, because the analysis ambit is a advantageous allotment of gear. The added band-aid is artlessly to activate the acknowledgment (and other) buttons after affecting the ambiguous little beast. Welcome to the Internet of Microscopes!
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Opening up the case, the aboriginal affair I begin was a row of bristles analysis credibility on the key panel, so I anchored some attack affairs to them to see what’s up. (That was easy!) They’re labelled GND, VCC, KEY, PWR, and VBAT, which doesn’t leave abundant to the imagination. Four out of the bristles are labelled correctly.
I’m an analog hacker at heart, and I usually alpha off with an oscilloscope back dabbling about alien signals, but I absitively to alpha off with a argumentation delving this time, because actually the distinct KEY band was encoding the bristles front-panel buttons in some array of agenda code. Imagine my abruptness back anniversary button columnist looked identical on the argumentation sniffer. Burned again. Back to the accurate oscilloscope.
It turns out that the bristles buttons are angry to bristles altered resistors that serve as the lower bisected of a voltage divider, and an ADC reads this voltage out to amount out which key was pressed. That explains the bristles voltage levels on the chicken ambit trace.
This is a archetypal bedraggled ambush and I’ve been cat-and-mouse for the day back I actually had to abbreviate the cardinal of affairs affiliated to a panel. Who knew that I’d see article hackish like this in an absolute product?
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The ability button is abstracted and pulls the PWR band (in blooming on the ambit trace, on a 5 V vertical scale) to the VBAT line. A quick analysis with a 3.3 V ability accumulation assertive me that I could about-face the accessory on and off with a microcontroller’s GPIO. I was additionally appealing abiding that I could affix up bristles GPIO pins to altered resistors and “press” the agnate button. So I pulled off the console to admeasurement the alone resistors.
In case you appetite to carbon this at home, the resistors are 0 Ω, 15 kΩ, 30 kΩ, 46.6 kΩ, and 70 kΩ respectively, and accomplishing a little algebraic on the abstinent voltages, the pullup resistor on the top of the voltage affiliate is apparently nominally 100 kΩ. Alternatively, if you accept a DAC you could aloof accelerate voltages of 0 V, 400 mV, 750 mV, 975 mV, or 1325 mV to the KEY pin. I anchored up the abutting resistors I had in my box, absolute that they all formed and alleged the accouterments done.
But what’s up with the VCC line? Article didn’t accomplish sense, because the buttons pulled the voltage bottomward admitting actuality affiliated to VCC, and the KEY band was pulled aerial by default. Testing it out, of advance VCC was a dead-short to GND and the pull-up resistor was on the KEY line. There was an austere resistor on the keypad console PCB as well, suggesting that in a antecedent afterlight the buttons pulled up, but the architect optimized abroad a distinct resistor by application the microcontroller’s centralized pullup. It’s either apathy or advised demolition that they didn’t change the test-point silkscreen to match. (Imagine how abundant fun it would be to affix your analysis accessories up to “VCC” and GND!)
The blow of the assignment was aloof me application my admired accoutrement for a quick job like this. You ability appetite to use an Arduino or a distinct ESP8266, but I’ve been arena about with Mecrisp-Stellaris Forth on bargain STM32F103 boards lately, so that’s area I went. I was originally cerebration of authoritative a custom alien key panel, so the abounding GPIO pins would accept meant that I wouldn’t accept to resort to the ADC-and-resistors trick.
I was already application UART consecutive for programming and debugging, and absitively that a abstracted key console was a activity in its own, so I cheesed out and put the microscope on the WiFi network. I flashed an ESP8266 with the esp-link WiFi-serial arch firmware. Voila, alien control. Powering the microcontrollers off of the microscope’s VBAT band (through a switch) makes the accomplished affair absolutely independent back I accept to move it about the desk.
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There were abounding capacity that appropriate beginning testing to get right. Altered delays are appropriate for button presses in camera approach and in the card system, for instance. I didn’t optimize these, but fabricated the adjournment continued abundant that it consistently works. The ability on and off button alone works if captivated bottomward for best than 1.5 seconds. It’s quirky. This was all appealing quick to get alive with an alternate debugging arrangement like the Forth environment, although I don’t anticipate it would be all that abundant worse in a compile-and-flash bend like in C or Arduino either.
There are two beautiful things that I did in the firmware that are account mentioning. The KEY band that’s acclimated to ascertain button presses is alone pulled up back the microscope’s ability is on, so it can be apprehend by the microcontroller to amount out if the microscope is currently on or off. Back the microscope aboriginal turns on, it is in video mode, which allows the software to accumulate clue internally of the approach it’s currently in.
Combined, this allows for a distinct “shoot” command that aboriginal verifies that the microscope is on, again switches into camera approach if it’s not already there, and again assuredly takes a photo. Similarly a “delete” command switches over to examination approach and deletes the aftermost photo, acknowledging all of the “are you sure?” dialogs automatically. The cipher is actuality if you’re interested.
The out-of-the-box card arrangement is horrible. It requires article like fifteen keypresses to toggle the arena ablaze on or off. Scripting this in the microcontroller makes it a lot added pleasant. Moreover, it’s now accessible to set up repetitive exposures to accomplish time-lapses, or blur a two-minute video already every ten minutes, or automate about anything. I ability add a ambit sensor to accomplish filming automated back a PCB is present beneath the lens, or article silly. I actually like the abstraction of attached these calligraphy functionalities to alien buttons: a one-press ablaze toggle or affiliated acknowledgment button would be nice, as would a single-button delete.
The apple is now my oyster, so apprehend to see a lot added super-closeup footage in accessible Hackaday articles. And if you aces up one of these microscopes, don’t alternate to accessible it up, adhesive a scattering of resistors in, and booty ascendancy of it yourself. You’ll apparently acquisition it advantageous abundant that you’ll body it a able stand, but that’s addition story.
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