SainSmart DS802 Review – A Dual Channel Virtual PC Oscilloscope

DS802 Oscilloscope Arduino

Hey Karl here. Today we’re going to look at the SainSmart DS802 Dual-channel oscilloscope. I have always wanted to have an oscilloscope and add it to my tools. When SainSmart asked to review the DS802, I was pretty excited. I can get my nerd on and troubleshoot all kinds of things. A couple weeks later it arrives and my anxiety kicks in. How the heck do I review an oscilloscope. I used an oscilloscope in high school in a class called principles of technology. But we never really went into much depth and only looked at the signals generated by a signal generator. I understand the basics. This is written from a perspective of a complete noob. SainSmart DS802 Specs Pulled directly from Sainsmarts website: Channels: 2 Analog channels Interface: USB 2.0 Output: 1k HZ amplitude 1.5V, 50% duty cycle square wave signal Maximum sampling rate: 80 MSps per channel Vertical resolution: 8 bit Voltage range: ±5v, expandable to ±50v …

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Radxa Rock Pi 4 Review – Part 1: A First Look at RockPi 4B Performance Set

Rock Pi 4 Review

Hey, Karl here with another RK3399 board. This one is by Radxa and is called the Rock Pi 4. There are 2 main variants to this board and I was shipped the B version “performance set” which includes a power supply, heatsink, and acrylic case. Also shipped was 16gb eMMC 5.1 module, eMMC flashing board, and USB-TTL debug cable. It looks like the difference is the B version has AC wifi and GbE LAN with PoE support with a hat. The A version only has GbE. Rock Pi 4B Performance Set Unboxing Some of the more notable specs eMMC module support M.2 NVME SSD support (SATA not supported) HDMI 2.0 [email protected] MIPI DSI 2 lanes via FPC connector 3.5mm audio jack MIPI CSI 2 lanes via FPC connector, support up to 8MP camera 802.11 ac wifi Bluetooth 5.0 40-pin expansion header :  1 x UART 2x SPI bus 2x I2C bus 1x PCM/I2S1 1x SPDIF 1 x PWM 1x ADC …

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Khadas Edge Review – Part 3: Android 7.0 Preview

Khadas Edge Android 7.0

Hey Karl here with a look at a preview of Android on the Khadas edge. Jean-luc has done 2 parts already. The first one looking at the hardware side, and a second looking at Ubuntu. A third img is available that for LibreELEC. The initial release was very barebones, and the 2nd version is much more polished with the Play Store installed now and overall feels snappier. Khadas is supposed to be sending an Edge over to Super Celeron, and I hope they follow through. DHL DHL really messed up my board. Here are some pics. I will only be testing with Ethernet because the WiFi antenna got damaged badly and even bent the heatsink. I think the board is slightly damaged as well. I can only flash using the buttons on the board and not the carrier board. Everything else seems OK. Due to the damage I am using a heatsink that I had. I took some temp readings …

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Tis the season so they say

donate

Hey Karl here with a short post…I know everyone on here has their hobbies and thanks to Jean-Luc, and Gearbest I have been able to explore 3D printing for nearly 2 years. I want to express gratitude towards 3 extremely active individuals who help 3D printing, and donate a lot of their time.  They help and rarely get showcased on their own. Thinkyhead aka Scott Lahteine You may not know Scott but I’m sure his code is in your 3D printer. Over the past two years I’ve opened a couple issues on Marlin on the Github page and he has helped out both times. I’m writing this today to encourage everyone to contribute to Scott’s Patreon. Marlin is at the cusp of releasing 2.0 which brings a lot a change and a lot of work. One thing that all the printers I have reviewed have in common is Marlin firmware. Marlin is an open source project and is developed by …

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Geeetech A20M Review – A Dual Extruder, Color Mixing 3D Printer

Geeetech A20M 3D Printer Samples

Hey Karl here with a 3D printer review. I know it has been a while for a printer review and grateful for Gearbest sending the review unit. They shipped me the Geeetech A20M a single nozzle, mixing, dual extruder 3D printer. Man that was a mouth full. It is a follow up to the A10M which is similar but a smaller build volume. The A20M clocks in with a 255x255x255mm build volume. My last foray with a multi material printer was a Tevo Tarantula and it was mildly successful. I didn’t realize that this was a mixing extruder and the implications. I have done some very cool looking prints due to the fact that it’s a mixing extruder. QC Issues I always come to expect some QC issues with these low cost printers. But I have to say that this printer has had the most. Let me list with fixes Z stepper motor bent…..replace z stepper motor Fan for part …

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Genmitsu CNC Router Review – Part 1.5: Laser Attachment

Genmitsu CNC -Router Laser Review

Hey Karl here with a small update for the SainSmart Genmitsu CNC Router 3018 review. In the first part I described the build and first cuts. And in this part I am calling it 1.5 because it is to just talk about the optional laser attachment that was just made available and initial impressions. In the first part I commented about the laser connector on the board. The stars aligned and Sainsmart asked if we wanted to check out their  2.5W PWM controlled laser sold for $89.99 with free shipping. Installation In the box all you get is the laser itself and some eye protection. At first I wanted to mount the laser on the side of the tool head so it would be easy to change between CNC and the laser. I took the laser apart and was going to use the 2 mounting holes and ended up breaking a solder connection for the fan. After soldering the wire …

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Genmitsu CNC 3018-PRO CNC Router Review – Part 1: Build & First Etches

Sainsmart 3018 CNC Router

Hey Karl here. Today we are going to look at something a little different. I am writing about my experiences with building Genmitsu 3018 CNC router upgraded version provided by Sainsmart for this review. While waiting on the unit to arrive I did some research and found that there are several different versions on the market labeled CNC xxxx. The xxxx represent the build volume in the x and y. So the one I was sent has a 300x180mm build volume. The 3018 is called upgraded because the new mounting for the X and Y rods and lead screws. On the previous version these had to be mounted and manually aligned which from what I read can be a pain. Building Genmitsu CNC 3018-PRO CNC Router The build went very well. The 3018 user manual was mostly pictures but they called out anything that might be questionable. I had been talking about the CNC/engraver with my kids and they were …

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YouTube Streams 1 & 2 Update, Plus Quick Fix for Uneven X Gantry

3D-Printer-X-Gantry-Fix

Hey Karl here with an update on the YouTube Live streams from last week. Live Streams Update The 1st stream went about as well as I expected….Not very well. I was really nervous and I broke the live link that was posted on here at the last minute. My whole reasoning for the Livestream was to show the processes in real time and not do too much footwork ahead of time. On the first one I was planning on migrating from Marlin 1.1.6 to Marlin 1.1.8 but I had already done lol… So I ended up migrating to the bugfix branch which presented additional challenges. Overall it was successful and I hope I conveyed the process. I was able to get it to print but I ended up going back to 1.1.8 due to some error in the bugfix branch that caused weird jittery movement. I will in the future prepare more. 😀 Second was better but not without glitches. …

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