An update on LuckyResistor’s data logger project:
Just to let you know the deluxe version of the data logger is almost done. The hardware is ready and tested – currently I finish the menu based software for the data logger.
Menu based control with 5 capacitive inputs
Record, view records, send records to serial, erase all, settings
Wireless charging
Data Logger Deluxe Version – [Link]
by Graham Prophet:
LT8330 is a current mode, 2 MHz step-up DC/DC converter with an internal 1A, 60V switch. It operates from an input voltage range of 3V to 40V, making it suitable for applications with input sources ranging from a single-cell Li-Ion to automotive inputs.
The device can be configured as either a boost, SEPIC or an inverting converter. It uses a fixed 2 MHz switching frequency, enabling designers to minimise external component sizes and avoid critical frequency bands, such as AM radio. Burst Mode operation reduces quiescent current to 6 µA while keeping output ripple below 15 mVP-P. The combination of a 3 x 2 mm DFN or TSOT-23 package and tiny externals ensures a very compact footprint while minimising overall cost.
1A, 2 MHz, 60V boost/SEPIC/inverting DC/DC converter, 6µA Iq – [Link]
Freeze 75 spray will enable you to find faulty component or also to protect components from overheating during soldering.
A device operates OK until it reaches stable operating temperature … a typical situation in praxis usually caused by a faulty component or faulty (cold) joint. Localization of such a fault is easy only if we can cool down (locally) a given component or a given joint. It´s often possible to suppose a source of malfunction, but to be able to localize it exactly, we´d need to change temperature of only one component or only a small PCB area. Right for this purpose a well known spray Freeze 75, is designed, able to cool down (freeze) a given component very significantly – in laboratory testing down to -52°C. And what about other possibilities of usage?
There are a lot of them. For example a local (preventive) cooling at soldering of temperature-sensitive components like temperature fuses or cooling of sensitive components near a soldered joint (for example soldering of a relatively bulky RF connector at a sensitive RF component, protection of plastic parts etc.) Another unusual help is at removing a rubber-like sticky substances from various places and textile. A typical example is removing of a chewing gum. Freeze 75 is also used in medicine, in machine engineering for shrinkage of small components etc.
How does the Freeze 75 function?
Again we´ll call for help a grammar school physics. When we go out of a swimming pool, we usually feel cold, even though there´s a warm weather outside. The reason is the water evaporating from our skin. Evaporating liquid consumes heat from a given surface. This is also a case of Freeze 75, which is filled by liquids with boiling point deeply below the frost point thus taking a lot of heat from a surface on which it is applied. Freeze 75 is non-flammable, non-explosive at all usual conditions and it also doesn´t attack plastics. It´s only advisable to be careful at components sensitive to sudden temperature changes. For absolutely highest safety in critical applications, the Freeze 75 Super is available, which is non-explosive at any circumstances.
After application of Freeze 75 in moisty environment a small amount of water can condense on a given component, consequently freezing into a whitish coating. This coating will gradually defreeze and evaporate or it can be readily removed by a water miscible solvent like for example Kontakt WL. Freeze 75 (originally marked as Kalte 75) we keep on stock in 200ml as well as 400 ml package. Detailed information will give you the Freeze 75 datasheet.
Freeze 75 – and you have a temperature under control – [Link]
by Maciej Kokot @ edn.com:
In most cases, you measure current by converting it into a proportional voltage and then measuring the voltage. Figure 1 shows two typical methods of making the conversion. In one method, you insert a probing resistor, RP, in series with the current path and use differential amplifier IC1 to measure the resulting voltage drop (Figure 1a). A second method is a widely known operational amplifier current-to-voltage converter in which inverted IC1’s output sinks the incoming current through the feedback resistor (Figure 1b).
Measure small currents without adding resistive insertion loss – [Link]
This reference design is a frequency generator for use in synchronizing a circuit’s operation. It consumes less than 50mW of power that specifically uses the IDT’s 9FGV0241 PCI-Express Clock Generator which is the lowest-power PCI Express timing family. It is a two output clock generator with programmable output amplitude allowing tuning for various application environments.
The circuit reduces heat dissipation to ease cooling requirements in large scale cloud computing applications. It has a programmable slew rate allowing tuning for various line lengths with an integrated output termination of 100Ω, providing maximum flexibility when working in a non-homogenous timing environment. In addition, the device has an external 25MHz crystal that supports tight parts per million (ppm) with 0 ppm synthesis error.
These clock synthesizers have various applications such as communications, computing, and consumer goods. Most members of IDT timing family feature a selectable SMBus address so that multiple devices can seamlessly share the same SMBus segment without the cumbersome additional logic that is often required with other solutions.
PCI-Express Clock Generator – [Link]
Limpkin has modified his IKEA lamp to use 10W LEDs.
So for some reason I bought 2 IKEA lamps at a flea market. As IKEA furniture has a long history of being hacker-friendly, I figured they shouldn’t be an exception to the rule.
My plan? Fit a few 10W RGB LEDs in there together with an ESP8266 to use the final result as an alarm clock.When you are dealing with a LED consuming that much current, you can’t simply use a series resistor as the latter would need to dissipate R*I² in heat. I’m therefore using a dedicated LED driver that automatically adjusts the LED voltage to match a given current. As you can guess, it isn’t much different than a standard step-down and just uses a shunt resistor to measure the current flowing through the LED.
A Connected Lamp to Wake Me Up – [Link]
by Marcus Jenkins:
This gadget steps up the game from leaving a light on at home when you’re out. Place it near a window to make it look like somebody’s at home watching TV.
The idea of leaving a light on at home while you’re out is to give the burglar an uneasy feeling that somebody’s at home and it might be worth trying the next house along instead. A TV on at night plays a constantly-changing light-show against your window which really does say I’m at home and I’m awake. Of course, you could leave a real TV on but that’s an eco-disaster since TV’s consume 50W at best and hundreds at worst. Plus you might not want to be burning your TV in for days on end if you’re not at home.
Fake TV Security Light – [Link]
by Akshay Jha @ instructables.com:
In this short instructable I am gonna displ some graphics on Nokia 5110 LCD using ARDUINO UNO R3 this is very helpful for beginners`s here is a testing video .
Graphics on Nokia 5110 Lcd using Arduino – [Link]
electrobob.com has build a device that alerts you if sitting to long:
Sitting for long periods has become more common in today’s jobs causing serious health issues. Unfortunately the plethora of activity trackers fail to address the issue: being rather active while sitting does not provide a good picture of the amount of time spent sitting.
Sit.Up is a simple device that attaches to the chair and alerts the user by vibration if sitting for too long while also tracking the sitting time. It aims to be easy to install and forget on any chair and work with any person. On top of that, it is very low cost and has months to years of battery life. With an optional WiFi connection, the data can be uploaded and you can track your sitting times.
Sit.Up – alerts the user if sitting to long – [Link]
SIGLENT’s SDM3055 series is a dual display digital desktop multimeter. The SDM3055 provides a rich and powerful feature set at an excellent price. This DMM family is well suited for production testing, R&D and certification work, as well as any place ｗｈｅｒｅ an accurate and powerful full-function DMM is needed. In the SDM3055’s design and layout, great emphasis was given on both front-panel and computer-based control of the instrument. Equipped with a 4.3 inch TFT-LCD true color LCD screen, its display resolution is up to 480 * 272. It can not only display numerical readings, but also supports histograms, trend charts, bar charts and statistics, in addition to the built-in arithmetic functions. Even when using the front-panel menu, the user can display the most important analysis results of the accumulation of time and data. This eliminates the process of drawing and statistics, and the measurement is accurate and reliable. The SIGLENT SDM3055 has a powerful testing engine, measuring speed up to 150rdgs / s, 1Gb Nand total memory capacity, mass storage instrument settings, historical data, and external U disk external storage. The SDM3055 interfaces include USB Device, USB Host, LAN and GPIB (SDM3055A). It can support VXI11, USBTMC remote control as well as interconnection with National Instruments’ LabVIEW. A SCPI command programming manual is also provided in support of remote control operation programming.It is compatible with mainstream multimeter command sets and uses the compatible language with SCPI for transmission and control.
Siglent SDM3055 5.5 Digit Bench Multimeter Review – [Link]
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