Hello manufacturer. Good device. But software we want to customize. If you allow, we will buy more.
Despite being advertised as "4K 1080P", it really downscales those to 720P.
But for 28.50 EUR from Amazon Warehuose Germany in 2025, one can't exactly complain. https://www.amazon.de/dp/B0DSP74YQW
Chengdu Hotack Technology Co., Ltd. is the OEM?
This guide aims to design boards that pass DFM analysis, considering JLCPCB's capabilities specifications. It assumes designs of at least 4 layers, 1oz copper max thickness, and the ENIG surface finish.
These are, according to JLCPCB at the time of writing:
| // This file is Copyright (c) 2025 Victor Suarez Rovere <suarezvictor@gmail.com> | |
| // SPDX-License-Identifier: AGPL-3.0-only | |
| #include "misc.h" | |
| #include "processing_api.h" | |
| using namespace processing; | |
| PGraphics canvas; |
| # Copyright (c) 2024 Victor Suarez Rovere <suarezvictor@gmail.com> | |
| # SPDX-License-Identifier: AGPL-3.0-only | |
| # code portions from LiteX framework (C) Enjoy-Digital https://github.com/enjoy-digital/litex | |
| import sys | |
| import argparse | |
| from migen import * | |
| from litex.soc.cores.clock import * | |
| from litex.soc.integration.builder import * |
| # This is an nmigen delay line for ECP5 FPGAs using the open source toolchain. It strings together a series of | |
| # manually placed carry chains into a "thermometer." It returns a signal that's (length) long that represents | |
| # the chain "snapshotted" at the primary clock domain (using the flip flops colocated in the slice). | |
| # | |
| # This can be used in a Time to Digital Converter (i.e. to measure the time between to events) or in | |
| # an ADC by comparing (with LVDS) a signal to a reference signal. | |
| # | |
| # Note that the bit precision (read: delay per carry element) varies as a function of temperature. On | |
| # a LFE5U-25F-8MG285C, I've measure delay times of approximately 43ps on average. Due to assorted reasons, | |
| # the delay time will vary between bits and due to variations in routing (even when manually places), you might |
| # This is an nmigen delay line for ECP5 FPGAs using the open source toolchain. It strings together a series of | |
| # manually placed carry chains into a "thermometer." It returns a signal that's (length) long that represents | |
| # the chain "snapshotted" at the primary clock domain (using the flip flops colocated in the slice). | |
| # | |
| # This can be used in a Time to Digital Converter (i.e. to measure the time between to events) or in | |
| # an ADC by comparing (with LVDS) a signal to a reference signal. | |
| # | |
| # Note that the bit precision (read: delay per carry element) varies as a function of temperature. On | |
| # a LFE5U-25F-8MG285C, I've measure delay times of approximately 43ps on average. Due to assorted reasons, | |
| # the delay time will vary between bits and due to variations in routing (even when manually places), you might |
| //Copyright (C) 2023 Victor Suarez Rovere <suarezvictor@gmail.com> | |
| #include <stdint.h> | |
| #include <stdio.h> | |
| #include <stdlib.h> | |
| typedef uint32_t uint18_t, uint19_t, uint27_t, uint23_t; | |
| typedef uint16_t uint9_t, uint10_t, uint15_t; | |
| typedef uint8_t uint1_t; |
| //comparison operator using adders | |
| //(C) 2023 Victor Suarez Rovere | |
| #include <stdio.h> | |
| //select type (all were tested) | |
| typedef unsigned char type; | |
| //typedef signed char type; | |
| //typedef unsigned short type; |
| //original at https://gist.github.com/a1k0n/8ea6516b4946ab36348fb61703dc3194 | |
| #include <stdint.h> | |
| #include <stdio.h> | |
| #include <string.h> | |
| #include <unistd.h> | |
| #include <math.h> | |
| #define debug(...) | |
| //#define debug printf |
| // Automatically generated C++ file on Sat Aug 26 14:20:23 2023 | |
| // | |
| // To build with Digital Mars C++ Compiler: | |
| // | |
| // dmc -mn -WD test0_x1.cpp kernel32.lib | |
| #include <stdio.h> | |
| #include <malloc.h> | |
| #include <stdarg.h> | |
| #include <time.h> |